2.5.0

* feat(request matchers): Add support for early mismatch in mapping processing

* test(request matchers): Add unit test for early mismatch functionality

* test(grpc): Add test for grpc requests early mismatch and error logging (Issue #1442)

* feat(request matchers): RequestMatcherType

Add `RequestMatcherType` to request matchers for improved type
identification

Closes #1442

* refactor(request matchers): Request

Replace `EarlyMatcherSelector` with `EarlyMatcherType` for improved
clarity and consistency

Closes #1442

* feat(request): conversion

Add EarlyMatcherType support in request models and mapping conversion

Closes #1442

* test(mapping): new tests

add unit tests for EarlyMatcherType in mapping conversion and
serialization

Closes #1442

* refactor(request matchers): RequestMessageEarlyMatcher

Replaced inline `EarlyMatcherType` logic with the new
`RequestMessageEarlyMatcher` class to support cases when several
matchers of the same type are present. For instance - Header, Cookie,
Param

Closes #1442

* test(request matchers): Early Mismatch

add unit tests for early mismatch scenarios with several matchers of
same type. Currently, headers and parameters

Closes #1442

* refactor(mapping): RequestModel.EarlyMatcherType

use fully qualified enum for EarlyMatcherType in serialization

Closes #1442

* style(review): fixes

- removed unused method
- added missing curly brackets

Closes #1442

.github/copilot-instructions.md

@@ -1,4 +0,0 @@
-# Copilot Instructions
-
-## Project Guidelines
-- All new byte[xx] calls should use using var data = ArrayPool<byte>.Shared.Lease(xx); instead of directly allocating byte arrays

.github/instructions/instructions.md

@@ -0,0 +1,15 @@
+---
+description: 'Guidelines for this solution'
+applyTo: '**/*.csproj, **/*.cs'
+---
+
+# Multi .NET Framework Targeting
+
+## Instructions
+- The main project "WireMock.Net.Minimal" targets `netstandard2.0` and `net8.0`. Ensure that any new code or dependencies are compatible with these frameworks.
+
+
+# C# Guidelines
+
+## Instructions
+- When a new ByteArray is needed, do not use `var data = new byte[bufferSize];`. Always use `var data = ArrayPool<byte>.Shared.Lease(bufferSize);`.

CHANGELOG.md

@@ -1,3 +1,25 @@
+# 2.5.0 (04 May 2026)
+- [#1451](https://github.com/wiremock/WireMock.Net/pull/1451) - Feature/early mismatch [feature] contributed by [Stepami](https://github.com/Stepami)
+- [#1452](https://github.com/wiremock/WireMock.Net/pull/1452) - Bump log4net from 2.0.15 to 3.3.0 in example console app [dependencies, .NET] contributed by [dependabot[bot]](https://github.com/apps/dependabot)
+- [#1453](https://github.com/wiremock/WireMock.Net/pull/1453) - Fix CVE-2026-40021: upgrade log4net to 3.3.0 in examples/WireMock.Net.Service/packages.config [dependencies] contributed by [Copilot](https://github.com/apps/copilot-swe-agent)
+- [#1442](https://github.com/wiremock/WireMock.Net/issues/1442) - Bug: [grpc] WithBodyAsProtoBuf exception on match [bug]
+
+# 2.4.0 (24 April 2026)
+- [#1437](https://github.com/wiremock/WireMock.Net/pull/1437) - Added feature to enable and disable mappings [feature] contributed by [jayaraman-venkatesan](https://github.com/jayaraman-venkatesan)
+- [#1450](https://github.com/wiremock/WireMock.Net/pull/1450) - Bump OpenTelemetry.Exporter.OpenTelemetryProtocol from 1.14.0 to 1.15.x [dependencies, .NET] contributed by [dependabot[bot]](https://github.com/apps/dependabot)
+- [#1421](https://github.com/wiremock/WireMock.Net/issues/1421) - Deactivate mapping without deleting it [feature]
+
+# 2.3.0 (20 April 2026)
+- [#1436](https://github.com/wiremock/WireMock.Net/pull/1436) - Moving Scenario state change before global response delay is set [feature] contributed by [jayaraman-venkatesan](https://github.com/jayaraman-venkatesan)
+- [#1440](https://github.com/wiremock/WireMock.Net/pull/1440) - Bump log4net from 2.0.15 to 3.3.0 [dependencies] contributed by [dependabot[bot]](https://github.com/apps/dependabot)
+- [#1443](https://github.com/wiremock/WireMock.Net/pull/1443) - Fix ExactMatcher and JsonMatcher not working for ISO dates as string [bug] contributed by [StefH](https://github.com/StefH)
+- [#1444](https://github.com/wiremock/WireMock.Net/pull/1444) - Update instructions.md [refactor] contributed by [StefH](https://github.com/StefH)
+- [#1448](https://github.com/wiremock/WireMock.Net/pull/1448) - Use DefaultJsonSerializer for BodyAsJson-Response [bug] contributed by [StefH](https://github.com/StefH)
+- [#1205](https://github.com/wiremock/WireMock.Net/issues/1205) - System.Private.Uri 4.3.0 Blackduck security High vulnerability [bug]
+- [#1260](https://github.com/wiremock/WireMock.Net/issues/1260) - Scenario state change before a response delay timeout ends [bug]
+- [#1441](https://github.com/wiremock/WireMock.Net/issues/1441) - ExactMatcher and JsonMatcher not working for ISO dates in v2.2.0 [bug]
+- [#1446](https://github.com/wiremock/WireMock.Net/issues/1446) - WithBodyAsJson does not return correctly formatted json when using SystemTextJsonConverter [bug]
+
 # 2.2.0 (30 March 2026)
 - [#1433](https://github.com/wiremock/WireMock.Net/pull/1433) - Add comments for ScenarioStateStore related code [refactor] contributed by [StefH](https://github.com/StefH)
 - [#1434](https://github.com/wiremock/WireMock.Net/pull/1434) - Upgrade Scriban.Signed [security] contributed by [StefH](https://github.com/StefH)

Directory.Build.props

@@ -4,7 +4,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <VersionPrefix>2.2.0</VersionPrefix>
+        <VersionPrefix>2.5.0</VersionPrefix>
         <PackageIcon>WireMock.Net-Logo.png</PackageIcon>
         <PackageProjectUrl>https://github.com/wiremock/WireMock.Net</PackageProjectUrl>
         <PackageLicenseExpression>Apache-2.0</PackageLicenseExpression>

Generate-ReleaseNotes.cmd

@@ -1,6 +1,6 @@
 rem https://github.com/StefH/GitHubReleaseNotes
 
-SET version=2.2.0
+SET version=2.5.0
 
 GitHubReleaseNotes --output CHANGELOG.md --skip-empty-releases --exclude-labels wontfix test question invalid doc duplicate example environment --version %version% --token %GH_TOKEN%
 

PackageReleaseNotes.txt

@@ -1,5 +1,7 @@
-# 2.2.0 (30 March 2026)
+# 2.5.0 (04 May 2026)
-- #1433 Add comments for ScenarioStateStore related code [refactor]
+- #1451 Feature/early mismatch [feature]
-- #1434 Upgrade Scriban.Signed [security]
+- #1452 Bump log4net from 2.0.15 to 3.3.0 in example console app [dependencies, .NET]
+- #1453 Fix CVE-2026-40021: upgrade log4net to 3.3.0 in examples/WireMock.Net.Service/packages.config [dependencies]
+- #1442 Bug: [grpc] WithBodyAsProtoBuf exception on match [bug]
 
 The full release notes can be found here: https://github.com/wiremock/WireMock.Net/blob/master/CHANGELOG.md

examples-Aspire/AspireApp1.ServiceDefaults/AspireApp1.ServiceDefaults.csproj

@@ -12,11 +12,11 @@
 
     <PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="8.4.0" />
     <PackageReference Include="Microsoft.Extensions.ServiceDiscovery" Version="8.0.0" />
-    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.8.1" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
-    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.8.1" />
+    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.3" />
-    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.8.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.2" />
-    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.8.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.15.1" />
-    <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.8.0" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.15.1" />
   </ItemGroup>
 
 </Project>

examples/WireMock.Net.Console.MimePart/WireMock.Net.Console.MimePart.csproj

@@ -16,7 +16,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\..\src\WireMock.Net\WireMock.Net.csproj" />
-        <PackageReference Include="log4net" Version="2.0.15" />
+        <PackageReference Include="log4net" Version="3.3.0" />
         <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     </ItemGroup>
 

examples/WireMock.Net.Console.NET8/WireMock.Net.Console.NET8.csproj

@@ -18,7 +18,7 @@
 
     <ItemGroup>
         <ProjectReference Include="..\..\src\WireMock.Net\WireMock.Net.csproj" />
-        <PackageReference Include="log4net" Version="2.0.15" />
+        <PackageReference Include="log4net" Version="3.3.0" />
         <PackageReference Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
     </ItemGroup>
 

examples/WireMock.Net.OpenTelemetryDemo/WireMock.Net.OpenTelemetryDemo.csproj

@@ -8,9 +8,9 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.15.3" />
-        <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.15.1" />
-        <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
     </ItemGroup>
 
     <ItemGroup>

examples/WireMock.Net.Service/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="log4net" version="2.0.15" targetFramework="net48" />
+  <package id="log4net" version="3.3.0" targetFramework="net48" />
   <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net452" />
   <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net452" />

examples/WireMock.Net.WebApplication.IIS/App.cs

@@ -1,29 +1,18 @@
 // Copyright © WireMock.Net
 
-using Microsoft.Extensions.Hosting;
-using System.Threading;
-using System.Threading.Tasks;
-
 namespace WireMock.Net.WebApplication;
 
-public class App : IHostedService
+public class App(IWireMockService service) : IHostedService
 {
-    private readonly IWireMockService _service;
-        
-    public App(IWireMockService service)
-    {
-        _service = service;
-    }
-
     public Task StartAsync(CancellationToken cancellationToken)
     {
-        _service.Start();
+        service.Start();
         return Task.CompletedTask;
     }
 
     public Task StopAsync(CancellationToken cancellationToken)
     {
-        _service.Stop();
+        service.Stop();
         return Task.CompletedTask;
     }
 }

examples/WireMock.Net.WebApplication.IIS/Program.cs

@@ -1,9 +1,5 @@
 // Copyright © WireMock.Net
 
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Logging;
 using WireMock.Settings;
 
 namespace WireMock.Net.WebApplication;

examples/WireMock.Net.WebApplication.IIS/WireMock.Net.WebApplication.IIS.csproj

@@ -15,7 +15,6 @@
     </ItemGroup>
 
     <ItemGroup>
-        <ProjectReference Include="..\..\src\WireMock.Net.Abstractions\WireMock.Net.Abstractions.csproj" />
         <ProjectReference Include="..\..\src\WireMock.Net\WireMock.Net.csproj" />
     </ItemGroup>
 

examples/WireMock.Net.WebApplication.IIS/WireMockService.cs

@@ -1,7 +1,5 @@
 // Copyright © WireMock.Net
 
-using System;
-using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Newtonsoft.Json;
 using WireMock.Admin.Requests;

examples/WireMock.Net.WebApplication.IIS/appsettings.json

@@ -15,7 +15,7 @@
     "WireMockServerSettings": {
         "StartAdminInterface": true,
         "Urls": [
-            "http://localhost"
+            "http://localhost:0"
         ]
     }
 }

examples/WireMock.Net.WebApplication.IIS/web.config

@@ -1,12 +1,17 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
-  <!--
+    <!--
     Configure your application settings in appsettings.json. Learn more at http://go.microsoft.com/fwlink/?LinkId=786380
-  -->
+    -->
-  <system.webServer>
+    <system.webServer>
-    <handlers>
+        <handlers>
-      <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
+            <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
-    </handlers>
+        </handlers>
-    <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" />
+        <httpProtocol>
-  </system.webServer>
+            <customHeaders>
+                <add name="X-Frame-Options" value="SAMEORIGIN" />
+            </customHeaders>
+        </httpProtocol>
+        <aspNetCore processPath="%LAUNCHER_PATH%" arguments="%LAUNCHER_ARGS%" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" />
+    </system.webServer>
 </configuration>

src/WireMock.Net.Abstractions/Admin/Mappings/MappingModel.cs

@@ -61,6 +61,11 @@ public class MappingModel
     /// </summary>
     public int? TimesInSameState { get; set; }
 
+    /// <summary>
+    /// Value to determine if the mapping is disabled. Defaults to <c>null</c> (not disabled).
+    /// </summary>
+    public bool? IsDisabled { get; set; }
+
     /// <summary>
     /// The request model.
     /// </summary>

src/WireMock.Net.Abstractions/Admin/Mappings/RequestModel.cs

@@ -1,5 +1,7 @@
 // Copyright © WireMock.Net
 
+using WireMock.Matchers.Request;
+
 namespace WireMock.Admin.Mappings;
 
 /// <summary>
@@ -66,4 +68,10 @@ public class RequestModel
     /// Gets or sets the body.
     /// </summary>
     public BodyModel? Body { get; set; }
+
+    /// <summary>
+    /// Type of the request matcher to return an immediate mismatch during mapping processing.
+    /// Optional.
+    /// </summary>
+    public RequestMatcherType? EarlyMatcherType { get; set; }
 }

src/WireMock.Net.Abstractions/Matchers/Request/IRequestMatcher.cs

@@ -7,6 +7,11 @@ namespace WireMock.Matchers.Request;
 /// </summary>
 public interface IRequestMatcher
 {
+    /// <summary>
+    /// Gets the request matcher's type.
+    /// </summary>
+    public RequestMatcherType Type { get; }
+
     /// <summary>
     /// Determines whether the specified RequestMessage is match.
     /// </summary>

src/WireMock.Net.Abstractions/Matchers/Request/RequestMatcherType.cs

@@ -0,0 +1,84 @@
+// Copyright © WireMock.Net
+
+namespace WireMock.Matchers.Request;
+
+/// <summary>
+/// List of predefined request matcher types.
+/// </summary>
+public enum RequestMatcherType
+{
+    /// <summary>
+    /// RequestMessageBodyMatcher
+    /// </summary>
+    Body = 0,
+
+    /// <summary>
+    /// RequestMessageBodyMatcher{T}
+    /// </summary>
+    BodyOfT = 1,
+
+    /// <summary>
+    /// RequestMessageClientIPMatcher
+    /// </summary>
+    ClientIP = 2,
+
+    /// <summary>
+    /// RequestMessageCookieMatcher
+    /// </summary>
+    Cookie = 3,
+
+    /// <summary>
+    /// RequestMessageGraphQLMatcher
+    /// </summary>
+    GraphQL = 4,
+
+    /// <summary>
+    /// RequestMessageHeaderMatcher
+    /// </summary>
+    Header = 5,
+
+    /// <summary>
+    /// RequestMessageHttpVersionMatcher
+    /// </summary>
+    HttpVersion = 6,
+
+    /// <summary>
+    /// RequestMessageMethodMatcher
+    /// </summary>
+    Method = 7,
+
+    /// <summary>
+    /// RequestMessageMultiPartMatcher
+    /// </summary>
+    MultiPart = 8,
+
+    /// <summary>
+    /// RequestMessageParamMatcher
+    /// </summary>
+    Param = 9,
+
+    /// <summary>
+    /// RequestMessagePathMatcher
+    /// </summary>
+    Path = 10,
+
+    /// <summary>
+    /// RequestMessageProtoBufMatcher
+    /// </summary>
+    ProtoBuf = 11,
+
+    /// <summary>
+    /// RequestMessageScenarioAndStateMatcher
+    /// </summary>
+    ScenarioAndState = 12,
+
+    /// <summary>
+    /// RequestMessageUrlMatcher
+    /// </summary>
+    Url = 13,
+
+    /// <summary>
+    /// RequestMessageCompositeMatcher
+    /// </summary>
+    Composite = 14
+}

src/WireMock.Net.Extensions.Routing/WireMock.Net.Extensions.Routing.csproj

@@ -25,7 +25,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="JsonConverter.Abstractions" Version="0.8.0" />
+      <PackageReference Include="JsonConverter.Abstractions" Version="0.9.0" />
     </ItemGroup>
 
     <ItemGroup>

src/WireMock.Net.Minimal/Mapping.cs

@@ -62,6 +62,9 @@ public class Mapping : IMapping
     /// <inheritdoc />
     public bool IsProxy => Provider is ProxyAsyncResponseProvider;
 
+    /// <inheritdoc />
+    public bool IsDisabled { get; set; }
+
     /// <inheritdoc />
     public bool LogMapping => Provider is not (DynamicResponseProvider or DynamicAsyncResponseProvider);
 

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageBodyMatcher.cs

@@ -142,6 +142,9 @@ public class RequestMessageBodyMatcher : IRequestMatcher
         MatchOperator = matchOperator;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Body;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageBodyMatcher`1.cs

@@ -31,6 +31,9 @@ public class RequestMessageBodyMatcher<T> : IRequestMatcher
         Func = Guard.NotNull(func);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.BodyOfT;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageClientIPMatcher.cs

@@ -74,6 +74,9 @@ public class RequestMessageClientIPMatcher : IRequestMatcher
         Funcs = Guard.NotNull(funcs);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.ClientIP;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageCompositeMatcher.cs

@@ -20,6 +20,11 @@ public abstract class RequestMessageCompositeMatcher : IRequestMatcher
     /// </value>
     private IEnumerable<IRequestMatcher> RequestMatchers { get; }
 
+    /// <summary>
+    /// Selected type to choose the matcher from <see cref="RequestMatchers"/> which will immediately return a mismatch.
+    /// </summary>
+    internal RequestMatcherType? EarlyMatcherType { get; private protected set; }
+
     /// <summary>
     /// Initializes a new instance of the <see cref="RequestMessageCompositeMatcher"/> class.
     /// </summary>
@@ -31,6 +36,9 @@ public abstract class RequestMessageCompositeMatcher : IRequestMatcher
         _type = type;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Composite;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {
@@ -39,6 +47,13 @@ public abstract class RequestMessageCompositeMatcher : IRequestMatcher
             return MatchScores.Mismatch;
         }
 
+        var earlyMatcher = new RequestMessageEarlyMatcher(EarlyMatcherType, RequestMatchers);
+        var earlyMatchResult = earlyMatcher.GetMatchingScore(requestMessage, requestMatchResult);
+        if (!MatchScores.IsPerfect(earlyMatchResult))
+        {
+            return MatchScores.Mismatch;
+        }
+
         if (_type == CompositeMatcherType.And)
         {
             return RequestMatchers.Average(requestMatcher => requestMatcher.GetMatchingScore(requestMessage, requestMatchResult));

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageCookieMatcher.cs

@@ -1,7 +1,6 @@
 // Copyright © WireMock.Net
 
 using Stef.Validation;
-using System.Linq;
 
 namespace WireMock.Matchers.Request;
 
@@ -93,6 +92,9 @@ public class RequestMessageCookieMatcher : IRequestMatcher
         Name = string.Empty; // Not used when Func, but set to a non-null valid value.
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Cookie;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageEarlyMatcher.cs

@@ -0,0 +1,35 @@
+// Copyright © WireMock.Net
+
+namespace WireMock.Matchers.Request;
+
+/// <summary>
+/// Return the mismatch if the matching score of matchers is not perfect.
+/// </summary>
+internal sealed class RequestMessageEarlyMatcher(
+    RequestMatcherType? earlyMatcherType,
+    IEnumerable<IRequestMatcher> requestMatchers) : IRequestMatcher
+{
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Composite;
+
+    /// <inheritdoc />
+    public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
+    {
+        if (earlyMatcherType is null)
+        {
+            return MatchScores.Perfect;
+        }
+
+        var earlyMatchers = requestMatchers
+            .Where(m => m.Type == earlyMatcherType)
+            .ToList();
+
+        if (earlyMatchers.Count is 0)
+        {
+            return MatchScores.Perfect;
+        }
+
+        var compositeMatcher = new RequestBuilders.Request(earlyMatchers);
+        return compositeMatcher.GetMatchingScore(requestMessage, requestMatchResult);
+    }
+}

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageHeaderMatcher.cs

@@ -1,6 +1,5 @@
 // Copyright © WireMock.Net
 
-using System.Linq;
 using Stef.Validation;
 using WireMock.Types;
 
@@ -12,7 +11,7 @@ namespace WireMock.Matchers.Request;
 /// <inheritdoc cref="IRequestMatcher"/>
 public class RequestMessageHeaderMatcher : IRequestMatcher
 {
-    private const string _name = nameof(RequestMessageCookieMatcher);
+    private const string _name = nameof(RequestMessageHeaderMatcher);
 
     /// <summary>
     /// MatchBehaviour
@@ -106,6 +105,9 @@ public class RequestMessageHeaderMatcher : IRequestMatcher
         Name = string.Empty; // Not used when Func, but set to a non-null valid value.
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Header;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageHttpVersionMatcher.cs

@@ -65,6 +65,9 @@ public class RequestMessageHttpVersionMatcher : IRequestMatcher
         MatcherOnStringFunc = Guard.NotNull(func);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.HttpVersion;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageMethodMatcher.cs

@@ -46,6 +46,9 @@ internal class RequestMessageMethodMatcher : IRequestMatcher
         MatchOperator = matchOperator;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Method;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageMultiPartMatcher.cs

@@ -55,6 +55,9 @@ public class RequestMessageMultiPartMatcher : IRequestMatcher
         MatchOperator = matchOperator;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.MultiPart;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageParamMatcher.cs

@@ -82,6 +82,9 @@ public class RequestMessageParamMatcher : IRequestMatcher
         Funcs = Guard.NotNull(funcs);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Param;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessagePathMatcher.cs

@@ -72,6 +72,9 @@ public class RequestMessagePathMatcher : IRequestMatcher
         Funcs = Guard.NotNull(funcs);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Path;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageScenarioAndStateMatcher.cs

@@ -29,6 +29,9 @@ internal class RequestMessageScenarioAndStateMatcher : IRequestMatcher
         _executionConditionState = executionConditionState;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.ScenarioAndState;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Matchers/Request/RequestMessageUrlMatcher.cs

@@ -72,6 +72,9 @@ public class RequestMessageUrlMatcher : IRequestMatcher
         Funcs = Guard.NotNull(funcs);
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.Url;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Minimal/Owin/IWireMockMiddlewareOptions.cs

@@ -2,6 +2,7 @@
 
 using System.Collections.Concurrent;
 using System.Security.Cryptography.X509Certificates;
+using JsonConverter.Abstractions;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using WireMock.Handlers;
@@ -99,4 +100,12 @@ internal interface IWireMockMiddlewareOptions
     /// WebSocket settings.
     /// </summary>
     WebSocketSettings? WebSocketSettings { get; set; }
+
+    /// <summary>
+    /// Gets or sets the default JSON converter used for serialization.
+    /// </summary>
+    /// <remarks>
+    /// Set this property to customize how objects are serialized to and deserialized from JSON during mapping.
+    /// </remarks>
+    IJsonConverter DefaultJsonSerializer { get; set; }
 }

src/WireMock.Net.Minimal/Owin/Mappers/OwinResponseMapper.cs

@@ -3,249 +3,242 @@
 using System.Globalization;
 using System.Net;
 using System.Text;
+using JsonConverter.Abstractions;
 using Microsoft.AspNetCore.Http;
-using Newtonsoft.Json;
 using RandomDataGenerator.FieldOptions;
 using RandomDataGenerator.Randomizers;
-using Stef.Validation;
 using WireMock.Http;
 using WireMock.ResponseBuilders;
 using WireMock.ResponseProviders;
 using WireMock.Types;
 using WireMock.Util;
 
-namespace WireMock.Owin.Mappers
+namespace WireMock.Owin.Mappers;
+
+/// <summary>
+/// OwinResponseMapper
+/// </summary>
+internal class OwinResponseMapper(IWireMockMiddlewareOptions options) : IOwinResponseMapper
 {
-    /// <summary>
+    private readonly IRandomizerNumber<double> _randomizerDouble = RandomizerFactory.GetRandomizer(new FieldOptionsDouble { Min = 0, Max = 1 });
-    /// OwinResponseMapper
+    private readonly IRandomizerBytes _randomizerBytes = RandomizerFactory.GetRandomizer(new FieldOptionsBytes { Min = 100, Max = 200 });
-    /// </summary>
+    private readonly Encoding _utf8NoBom = new UTF8Encoding(false);
-    internal class OwinResponseMapper : IOwinResponseMapper
+
+    // https://msdn.microsoft.com/en-us/library/78h415ay(v=vs.110).aspx
+    private static readonly IDictionary<string, Action<HttpResponse, bool, WireMockList<string>>> ResponseHeadersToFix =
+        new Dictionary<string, Action<HttpResponse, bool, WireMockList<string>>>(StringComparer.OrdinalIgnoreCase)
+        {
+            { HttpKnownHeaderNames.ContentType, (r, _, v) => r.ContentType = v.FirstOrDefault() },
+            { HttpKnownHeaderNames.ContentLength, (r, hasBody, v) =>
+                {
+                    // Only set the Content-Length header if the response does not have a body
+                    if (!hasBody && long.TryParse(v.FirstOrDefault(), out var contentLength))
+                    {
+                        r.ContentLength = contentLength;
+                    }
+                }
+            }
+        };
+
+    /// <inheritdoc />
+    public async Task MapAsync(IResponseMessage? responseMessage, HttpResponse response)
     {
-        private readonly IRandomizerNumber<double> _randomizerDouble = RandomizerFactory.GetRandomizer(new FieldOptionsDouble { Min = 0, Max = 1 });
+        if (responseMessage == null || responseMessage is WebSocketHandledResponse)
-        private readonly IRandomizerBytes _randomizerBytes = RandomizerFactory.GetRandomizer(new FieldOptionsBytes { Min = 100, Max = 200 });
-        private readonly IWireMockMiddlewareOptions _options;
-        private readonly Encoding _utf8NoBom = new UTF8Encoding(false);
-
-        // https://msdn.microsoft.com/en-us/library/78h415ay(v=vs.110).aspx
-        private static readonly IDictionary<string, Action<HttpResponse, bool, WireMockList<string>>> ResponseHeadersToFix =
-            new Dictionary<string, Action<HttpResponse, bool, WireMockList<string>>>(StringComparer.OrdinalIgnoreCase)
-            {
-                { HttpKnownHeaderNames.ContentType, (r, _, v) => r.ContentType = v.FirstOrDefault() },
-                { HttpKnownHeaderNames.ContentLength, (r, hasBody, v) =>
-                    {
-                        // Only set the Content-Length header if the response does not have a body
-                        if (!hasBody && long.TryParse(v.FirstOrDefault(), out var contentLength))
-                        {
-                            r.ContentLength = contentLength;
-                        }
-                    }
-                }
-            };
-
-        /// <summary>
-        /// Constructor
-        /// </summary>
-        /// <param name="options">The IWireMockMiddlewareOptions.</param>
-        public OwinResponseMapper(IWireMockMiddlewareOptions options)
         {
-            _options = Guard.NotNull(options);
+            return;
         }
 
-        /// <inheritdoc />
+        var bodyData = responseMessage.BodyData;
-        public async Task MapAsync(IResponseMessage? responseMessage, HttpResponse response)
+        if (bodyData?.GetDetectedBodyType() == BodyType.SseString)
         {
-            if (responseMessage == null || responseMessage is WebSocketHandledResponse)
+            await HandleSseStringAsync(responseMessage, response, bodyData);
-            {
+            return;
-                return;
+        }
-            }
 
-            var bodyData = responseMessage.BodyData;
+        byte[]? bytes;
-            if (bodyData?.GetDetectedBodyType() == BodyType.SseString)
+        switch (responseMessage.FaultType)
-            {
+        {
-                await HandleSseStringAsync(responseMessage, response, bodyData);
+            case FaultType.EMPTY_RESPONSE:
-                return;
+                bytes = IsFault(responseMessage) ? [] : await GetNormalBodyAsync(responseMessage).ConfigureAwait(false);
-            }
+                break;
 
-            byte[]? bytes;
+            case FaultType.MALFORMED_RESPONSE_CHUNK:
-            switch (responseMessage.FaultType)
+                bytes = await GetNormalBodyAsync(responseMessage).ConfigureAwait(false) ?? [];
-            {
+                if (IsFault(responseMessage))
-                case FaultType.EMPTY_RESPONSE:
-                    bytes = IsFault(responseMessage) ? [] : await GetNormalBodyAsync(responseMessage).ConfigureAwait(false);
-                    break;
-
-                case FaultType.MALFORMED_RESPONSE_CHUNK:
-                    bytes = await GetNormalBodyAsync(responseMessage).ConfigureAwait(false) ?? [];
-                    if (IsFault(responseMessage))
-                    {
-                        bytes = bytes.Take(bytes.Length / 2).Union(_randomizerBytes.Generate()).ToArray();
-                    }
-                    break;
-
-                default:
-                    bytes = await GetNormalBodyAsync(responseMessage).ConfigureAwait(false);
-                    break;
-            }
-
-            if (responseMessage.StatusCode is HttpStatusCode or int)
-            {
-                response.StatusCode = MapStatusCode((int) responseMessage.StatusCode);
-            }
-            else if (responseMessage.StatusCode is string statusCodeAsString)
-            {
-                // Note: this case will also match on null
-                _ = int.TryParse(statusCodeAsString, out var statusCodeTypeAsInt);
-                response.StatusCode = MapStatusCode(statusCodeTypeAsInt);
-            }
-
-            SetResponseHeaders(responseMessage, bytes != null, response);
-
-            if (bytes != null)
-            {
-                try
                 {
-                    await response.Body.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
+                    bytes = bytes.Take(bytes.Length / 2).Union(_randomizerBytes.Generate()).ToArray();
                 }
-                catch (Exception ex)
+                break;
+
+            default:
+                bytes = await GetNormalBodyAsync(responseMessage).ConfigureAwait(false);
+                break;
+        }
+
+        if (responseMessage.StatusCode is HttpStatusCode or int)
+        {
+            response.StatusCode = MapStatusCode((int)responseMessage.StatusCode);
+        }
+        else if (responseMessage.StatusCode is string statusCodeAsString)
+        {
+            // Note: this case will also match on null
+            _ = int.TryParse(statusCodeAsString, out var statusCodeTypeAsInt);
+            response.StatusCode = MapStatusCode(statusCodeTypeAsInt);
+        }
+
+        SetResponseHeaders(responseMessage, bytes != null, response);
+
+        if (bytes != null)
+        {
+            try
+            {
+                await response.Body.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                options.Logger.Warn("Error writing response body. Exception : {0}", ex);
+            }
+        }
+
+        SetResponseTrailingHeaders(responseMessage, response);
+    }
+
+    private static async Task HandleSseStringAsync(IResponseMessage responseMessage, HttpResponse response, IBodyData bodyData)
+    {
+        if (bodyData.SseStringQueue == null)
+        {
+            return;
+        }
+
+        SetResponseHeaders(responseMessage, true, response);
+
+        string? text;
+        do
+        {
+            if (bodyData.SseStringQueue.TryRead(out text))
+            {
+                await response.WriteAsync(text);
+                await response.Body.FlushAsync();
+            }
+        } while (text != null);
+    }
+
+    private int MapStatusCode(int code)
+    {
+        if (options.AllowOnlyDefinedHttpStatusCodeInResponse == true && !Enum.IsDefined(typeof(HttpStatusCode), code))
+        {
+            return (int)HttpStatusCode.OK;
+        }
+
+        return code;
+    }
+
+    private bool IsFault(IResponseMessage responseMessage)
+    {
+        return responseMessage.FaultPercentage == null || _randomizerDouble.Generate() <= responseMessage.FaultPercentage;
+    }
+
+    private async Task<byte[]?> GetNormalBodyAsync(IResponseMessage responseMessage)
+    {
+        var bodyData = responseMessage.BodyData;
+        switch (bodyData?.GetDetectedBodyType())
+        {
+            case BodyType.String:
+            case BodyType.FormUrlEncoded:
+                return (bodyData.Encoding ?? _utf8NoBom).GetBytes(bodyData.BodyAsString!);
+
+            case BodyType.Json:
+                var jsonConverterOptions = new JsonConverterOptions
                 {
-                    _options.Logger.Warn("Error writing response body. Exception : {0}", ex);
+                    WriteIndented = bodyData.BodyAsJsonIndented == true,
-                }
+                    IgnoreNullValues = true
-            }
+                };
 
-            SetResponseTrailingHeaders(responseMessage, response);
+                var jsonBody = options.DefaultJsonSerializer.Serialize(bodyData.BodyAsJson!, jsonConverterOptions);
-        }
+                return (bodyData.Encoding ?? _utf8NoBom).GetBytes(jsonBody);
 
-        private static async Task HandleSseStringAsync(IResponseMessage responseMessage, HttpResponse response, IBodyData bodyData)
+            case BodyType.ProtoBuf:
-        {
+                if (TypeLoader.TryLoadStaticInstance<IProtoBufUtils>(out var protoBufUtils))
-            if (bodyData.SseStringQueue == null)
-            {
-                return;
-            }
-
-            SetResponseHeaders(responseMessage, true, response);
-
-            string? text;
-            do
-            {
-                if (bodyData.SseStringQueue.TryRead(out text))
                 {
-                    await response.WriteAsync(text);
+                    var protoDefinitions = bodyData.ProtoDefinition?.Invoke().Texts;
-                    await response.Body.FlushAsync();
+                    return await protoBufUtils.GetProtoBufMessageWithHeaderAsync(protoDefinitions, bodyData.ProtoBufMessageType, bodyData.BodyAsJson).ConfigureAwait(false);
                 }
-            } while (text != null);
+                break;
+
+            case BodyType.Bytes:
+                return bodyData.BodyAsBytes;
+
+            case BodyType.File:
+                return options.FileSystemHandler?.ReadResponseBodyAsFile(bodyData.BodyAsFile!);
+
+            case BodyType.MultiPart:
+                options.Logger.Warn("MultiPart body type is not handled!");
+                break;
+
+            case BodyType.None:
+                break;
         }
 
-        private int MapStatusCode(int code)
+        return null;
+    }
+
+    private static void SetResponseHeaders(IResponseMessage responseMessage, bool hasBody, HttpResponse response)
+    {
+        // Force setting the Date header (#577)
+        AppendResponseHeader(
+            response,
+            HttpKnownHeaderNames.Date,
+            [DateTime.UtcNow.ToString(CultureInfo.InvariantCulture.DateTimeFormat.RFC1123Pattern, CultureInfo.InvariantCulture)]
+        );
+
+        // Set other headers
+        foreach (var item in responseMessage.Headers!)
         {
-            if (_options.AllowOnlyDefinedHttpStatusCodeInResponse == true && !Enum.IsDefined(typeof(HttpStatusCode), code))
+            var headerName = item.Key;
+            var value = item.Value;
+            if (ResponseHeadersToFix.TryGetValue(headerName, out var action))
             {
-                return (int)HttpStatusCode.OK;
+                action.Invoke(response, hasBody, value);
             }
-
+            else
-            return code;
-        }
-
-        private bool IsFault(IResponseMessage responseMessage)
-        {
-            return responseMessage.FaultPercentage == null || _randomizerDouble.Generate() <= responseMessage.FaultPercentage;
-        }
-
-        private async Task<byte[]?> GetNormalBodyAsync(IResponseMessage responseMessage)
-        {
-            var bodyData = responseMessage.BodyData;
-            switch (bodyData?.GetDetectedBodyType())
             {
-                case BodyType.String:
+                // Check if this response header can be added (#148, #227 and #720)
-                case BodyType.FormUrlEncoded:
+                if (!HttpKnownHeaderNames.IsRestrictedResponseHeader(headerName))
-                    return (bodyData.Encoding ?? _utf8NoBom).GetBytes(bodyData.BodyAsString!);
-
-                case BodyType.Json:
-                    var formatting = bodyData.BodyAsJsonIndented == true ? Formatting.Indented : Formatting.None;
-                    var jsonBody = JsonConvert.SerializeObject(bodyData.BodyAsJson, new JsonSerializerSettings { Formatting = formatting, NullValueHandling = NullValueHandling.Ignore });
-                    return (bodyData.Encoding ?? _utf8NoBom).GetBytes(jsonBody);
-
-                case BodyType.ProtoBuf:
-                    if (TypeLoader.TryLoadStaticInstance<IProtoBufUtils>(out var protoBufUtils))
-                    {
-                        var protoDefinitions = bodyData.ProtoDefinition?.Invoke().Texts;
-                        return await protoBufUtils.GetProtoBufMessageWithHeaderAsync(protoDefinitions, bodyData.ProtoBufMessageType, bodyData.BodyAsJson).ConfigureAwait(false);
-                    }
-                    break;
-
-                case BodyType.Bytes:
-                    return bodyData.BodyAsBytes;
-
-                case BodyType.File:
-                    return _options.FileSystemHandler?.ReadResponseBodyAsFile(bodyData.BodyAsFile!);
-
-                case BodyType.MultiPart:
-                    _options.Logger.Warn("MultiPart body type is not handled!");
-                    break;
-
-                case BodyType.None:
-                    break;
-            }
-
-            return null;
-        }
-
-        private static void SetResponseHeaders(IResponseMessage responseMessage, bool hasBody, HttpResponse response)
-        {
-            // Force setting the Date header (#577)
-            AppendResponseHeader(
-                response,
-                HttpKnownHeaderNames.Date,
-                [DateTime.UtcNow.ToString(CultureInfo.InvariantCulture.DateTimeFormat.RFC1123Pattern, CultureInfo.InvariantCulture)]
-            );
-
-            // Set other headers
-            foreach (var item in responseMessage.Headers!)
-            {
-                var headerName = item.Key;
-                var value = item.Value;
-                if (ResponseHeadersToFix.TryGetValue(headerName, out var action))
                 {
-                    action.Invoke(response, hasBody, value);
+                    AppendResponseHeader(response, headerName, value.ToArray());
-                }
-                else
-                {
-                    // Check if this response header can be added (#148, #227 and #720)
-                    if (!HttpKnownHeaderNames.IsRestrictedResponseHeader(headerName))
-                    {
-                        AppendResponseHeader(response, headerName, value.ToArray());
-                    }
                 }
             }
         }
-
+    }
-        private static void SetResponseTrailingHeaders(IResponseMessage responseMessage, HttpResponse response)
+
-        {
+    private static void SetResponseTrailingHeaders(IResponseMessage responseMessage, HttpResponse response)
-            if (responseMessage.TrailingHeaders == null)
+    {
-            {
+        if (responseMessage.TrailingHeaders == null)
-                return;
+        {
-            }
+            return;
-
+        }
-#if TRAILINGHEADERS
+
-            foreach (var (headerName, value) in responseMessage.TrailingHeaders)
+#if TRAILINGHEADERS
-            {
+        foreach (var (headerName, value) in responseMessage.TrailingHeaders)
-                if (ResponseHeadersToFix.TryGetValue(headerName, out var action))
+        {
-                {
+            if (ResponseHeadersToFix.TryGetValue(headerName, out var action))
-                    action.Invoke(response, false, value);
+            {
-                }
+                action.Invoke(response, false, value);
-                else
+            }
-                {
+            else
-                    // Check if this trailing header can be added to the response
+            {
-                    if (response.SupportsTrailers() && !HttpKnownHeaderNames.IsRestrictedResponseHeader(headerName))
+                // Check if this trailing header can be added to the response
-                    {
+                if (response.SupportsTrailers() && !HttpKnownHeaderNames.IsRestrictedResponseHeader(headerName))
-                        response.AppendTrailer(headerName, new Microsoft.Extensions.Primitives.StringValues(value.ToArray()));
+                {
-                    }
+                    response.AppendTrailer(headerName, new Microsoft.Extensions.Primitives.StringValues(value.ToArray()));
-                }
+                }
-            }
+            }
-#endif
+        }
-        }
+#endif
-
+    }
-        private static void AppendResponseHeader(HttpResponse response, string headerName, string[] values)
+
-        {
+    private static void AppendResponseHeader(HttpResponse response, string headerName, string[] values)
-            response.Headers.Append(headerName, values);
+    {
-        }
+        response.Headers.Append(headerName, values);
     }
 }

src/WireMock.Net.Minimal/Owin/MappingMatcher.cs

@@ -19,6 +19,7 @@ internal class MappingMatcher(IWireMockMiddlewareOptions options, IRandomizerDou
         var possibleMappings = new List<MappingMatcherResult>();
 
         var mappings = _options.Mappings.Values
+            .Where(m => !m.IsDisabled)
             .Where(m => m.TimeSettings.IsValid())
             .Where(m => m.Probability is null || _randomizerDoubleBetween0And1.Generate() <= m.Probability)
             .ToArray();

src/WireMock.Net.Minimal/Owin/WireMockMiddleware.cs

@@ -122,6 +122,14 @@ internal class WireMockMiddleware(
                 }
             }
 
+            // Transition scenario state immediately after matching, before any delay (global or
+            // per-mapping) so that concurrent retries arriving during a delay period see the
+            // updated state and match the correct next mapping instead of re-matching this one.
+            if (targetMapping.Scenario != null)
+            {
+                UpdateScenarioState(targetMapping);
+            }
+
             if (!targetMapping.IsAdminInterface && options.RequestProcessingDelay > TimeSpan.Zero)
             {
                 await Task.Delay(options.RequestProcessingDelay.Value).ConfigureAwait(false);
@@ -147,11 +155,6 @@ internal class WireMockMiddleware(
                 }
             }
 
-            if (targetMapping.Scenario != null)
-            {
-                UpdateScenarioState(targetMapping);
-            }
-
             if (!targetMapping.IsAdminInterface && targetMapping.Webhooks?.Length > 0)
             {
                 await SendToWebhooksAsync(targetMapping, request, response).ConfigureAwait(false);

src/WireMock.Net.Minimal/Owin/WireMockMiddlewareOptions.cs

@@ -2,6 +2,8 @@
 
 using System.Collections.Concurrent;
 using System.Security.Cryptography.X509Certificates;
+using JsonConverter.Abstractions;
+using JsonConverter.Newtonsoft.Json;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.Extensions.DependencyInjection;
 using WireMock.Handlers;
@@ -108,5 +110,9 @@ internal class WireMockMiddlewareOptions : IWireMockMiddlewareOptions
     /// <inheritdoc />
     public ConcurrentDictionary<Guid, WebSocketConnectionRegistry> WebSocketRegistries { get; } = new();
 
+    /// <inheritdoc />
     public WebSocketSettings? WebSocketSettings { get; set; }
+
+    /// <inheritdoc />
+    public IJsonConverter DefaultJsonSerializer { get; set; } = new NewtonsoftJsonConverter();
 }

src/WireMock.Net.Minimal/RequestBuilders/Request.cs

@@ -34,7 +34,7 @@ public partial class Request : RequestMessageCompositeMatcher, IRequestBuilder
     /// Initializes a new instance of the <see cref="Request"/> class.
     /// </summary>
     /// <param name="requestMatchers">The request matchers.</param>
-    private Request(IList<IRequestMatcher> requestMatchers) : base(requestMatchers)
+    internal Request(IList<IRequestMatcher> requestMatchers) : base(requestMatchers)
     {
         _requestMatchers = Guard.NotNull(requestMatchers);
     }
@@ -81,6 +81,13 @@ public partial class Request : RequestMessageCompositeMatcher, IRequestBuilder
         return this;
     }
 
+    /// <inheritdoc />
+    public IRequestBuilder WithEarlyMismatch(RequestMatcherType? earlyMatcherType)
+    {
+        EarlyMatcherType = earlyMatcherType;
+        return this;
+    }
+
     internal bool TryGetProtoBufMatcher([NotNullWhen(true)] out IProtoBufMatcher? protoBufMatcher)
     {
         protoBufMatcher = GetRequestMessageMatcher<RequestMessageProtoBufMatcher>()?.Matcher;

src/WireMock.Net.Minimal/Serialization/MappingConverter.cs

@@ -66,6 +66,12 @@ internal class MappingConverter(MatcherMapper mapper)
 
         // Request
         sb.AppendLine("    .Given(Request.Create()");
+
+        if (request.EarlyMatcherType != null)
+        {
+            sb.AppendLine($"        .WithEarlyMismatch({request.EarlyMatcherType.Value.GetFullyQualifiedEnumValue()})");
+        }
+
         sb.AppendLine($"        .UsingMethod({To1Or2Or3Arguments(methodMatcher?.MatchBehaviour, methodMatcher?.MatchOperator, methodMatcher?.Methods, HttpRequestMethod.GET)})");
 
         if (pathMatcher?.Matchers != null)
@@ -275,6 +281,7 @@ internal class MappingConverter(MatcherMapper mapper)
             TimesInSameState = !string.IsNullOrWhiteSpace(mapping.NextState) ? mapping.TimesInSameState : null,
             Data = mapping.Data,
             Probability = mapping.Probability,
+            IsDisabled = mapping.IsDisabled ? true : null,
             Request = new RequestModel
             {
                 Headers = headerMatchers.Any() ? headerMatchers.Select(hm => new HeaderModel
@@ -299,7 +306,9 @@ internal class MappingConverter(MatcherMapper mapper)
                     IgnoreCase = pm.IgnoreCase ? true : null,
                     RejectOnMatch = pm.MatchBehaviour == MatchBehaviour.RejectOnMatch ? true : null,
                     Matchers = _mapper.Map(pm.Matchers)
-                }).ToList() : null
+                }).ToList() : null,
+
+                EarlyMatcherType = request.EarlyMatcherType
             },
             Response = new ResponseModel()
         };

src/WireMock.Net.Minimal/Serialization/MappingSerializer.cs

@@ -1,6 +1,7 @@
 // Copyright © WireMock.Net
 
 using JsonConverter.Abstractions;
+using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 #if NETSTANDARD2_0_OR_GREATER || NETCOREAPP3_1_OR_GREATER || NET6_0_OR_GREATER || NET461
 using System.Text.Json;
@@ -10,9 +11,15 @@ namespace WireMock.Serialization;
 
 internal class MappingSerializer(IJsonConverter jsonConverter)
 {
+    private static readonly JsonConverterOptions JsonConverterOptions = new JsonConverterOptions
+    {
+        DateParseHandling = (int) DateParseHandling.None
+    };
+
     internal T[] DeserializeJsonToArray<T>(string value)
     {
-        return DeserializeObjectToArray<T>(jsonConverter.Deserialize<object>(value)!);
+        // DeserializeObject
+        return DeserializeObjectToArray<T>(jsonConverter.Deserialize<object>(value, JsonConverterOptions)!);
     }
 
     internal static T[] DeserializeObjectToArray<T>(object value)

src/WireMock.Net.Minimal/Server/IRespondWithAProvider.cs

@@ -234,6 +234,13 @@ public interface IRespondWithAProvider
     /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
     IRespondWithAProvider WithProbability(double probability);
 
+    /// <summary>
+    /// Define whether this mapping is disabled. Defaults to <c>false</c>.
+    /// </summary>
+    /// <param name="isDisabled">Whether this mapping is disabled.</param>
+    /// <returns>The <see cref="IRespondWithAProvider"/>.</returns>
+    IRespondWithAProvider WithIsDisabled(bool isDisabled);
+
     /// <summary>
     /// Define a Grpc ProtoDefinition which is used for the request and the response.
     /// This can be a ProtoDefinition as a string, or an id when the ProtoDefinitions are defined at the WireMockServer.

src/WireMock.Net.Minimal/Server/RespondWithAProvider.cs

@@ -37,6 +37,7 @@ internal class RespondWithAProvider : IRespondWithAProvider
     private int _timesInSameState = 1;
     private bool? _useWebhookFireAndForget;
     private double? _probability;
+    private bool _isDisabled = false;
     private GraphQLSchemaDetails? _graphQLSchemaDetails; // Future Use.
 
     public Guid Guid { get; private set; }
@@ -108,6 +109,11 @@ internal class RespondWithAProvider : IRespondWithAProvider
             mapping.WithProbability(_probability.Value);
         }
 
+        if (_isDisabled)
+        {
+            mapping.IsDisabled = true;
+        }
+
         if (ProtoDefinition != null)
         {
             mapping.WithProtoDefinition(ProtoDefinition.Value);
@@ -354,6 +360,13 @@ internal class RespondWithAProvider : IRespondWithAProvider
         return this;
     }
 
+    /// <inheritdoc />
+    public IRespondWithAProvider WithIsDisabled(bool isDisabled)
+    {
+        _isDisabled = isDisabled;
+        return this;
+    }
+
     /// <inheritdoc />
     public IRespondWithAProvider WithProtoDefinition(params string[] protoDefinitionOrId)
     {

src/WireMock.Net.Minimal/Server/WireMockServer.Admin.cs

@@ -1,6 +1,5 @@
 // Copyright © WireMock.Net
 
-using System.Linq;
 using System.Net;
 using System.Text;
 using JetBrains.Annotations;
@@ -26,9 +25,6 @@ using WireMock.Util;
 
 namespace WireMock.Server;
 
-/// <summary>
-/// The fluent mock server.
-/// </summary>
 public partial class WireMockServer
 {
     private const int EnhancedFileSystemWatcherTimeoutMs = 1000;
@@ -61,6 +57,8 @@ public partial class WireMockServer
         public string OpenApi => $"{_prefix}/openapi";
 
         public RegexMatcher MappingsGuidPathMatcher => new($"^{_prefixEscaped}\\/mappings\\/([0-9A-Fa-f]{{8}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{12}})$");
+        public RegexMatcher MappingsGuidEnablePathMatcher  => new($"^{_prefixEscaped}\\/mappings\\/([0-9A-Fa-f]{{8}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{12}})\\/enable$");
+        public RegexMatcher MappingsGuidDisablePathMatcher => new($"^{_prefixEscaped}\\/mappings\\/([0-9A-Fa-f]{{8}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{12}})\\/disable$");
         public RegexMatcher MappingsCodeGuidPathMatcher => new($"^{_prefixEscaped}\\/mappings\\/code\\/([0-9A-Fa-f]{{8}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{12}})$");
         public RegexMatcher RequestsGuidPathMatcher => new($"^{_prefixEscaped}\\/requests\\/([0-9A-Fa-f]{{8}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{4}}[-][0-9A-Fa-f]{{12}})$");
         public RegexMatcher ScenariosNameMatcher => new($"^{_prefixEscaped}\\/scenarios\\/.+$");
@@ -104,6 +102,12 @@ public partial class WireMockServer
         Given(Request.Create().WithPath(_adminPaths.MappingsGuidPathMatcher).UsingPut().WithHeader(HttpKnownHeaderNames.ContentType, AdminRequestContentTypeJson)).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingPut));
         Given(Request.Create().WithPath(_adminPaths.MappingsGuidPathMatcher).UsingDelete()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingDelete));
 
+        // __admin/mappings/{guid}/enable
+        Given(Request.Create().WithPath(_adminPaths.MappingsGuidEnablePathMatcher).UsingPut()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingEnable));
+
+        // __admin/mappings/{guid}/disable
+        Given(Request.Create().WithPath(_adminPaths.MappingsGuidDisablePathMatcher).UsingPut()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingDisable));
+
         // __admin/mappings/code/{guid}
         Given(Request.Create().WithPath(_adminPaths.MappingsCodeGuidPathMatcher).UsingGet()).AtPriority(WireMockConstants.AdminPriority).RespondWith(new DynamicResponseProvider(MappingCodeGet));
 
@@ -430,6 +434,47 @@ public partial class WireMockServer
         var lastPart = requestMessage.Path.Split('/').LastOrDefault();
         return Guid.TryParse(lastPart, out guid);
     }
+
+    private static bool TryParseGuidFromSecondToLastSegment(IRequestMessage requestMessage, out Guid guid)
+    {
+        var parts = requestMessage.Path.Split('/');
+        if (parts.Length >= 2 && Guid.TryParse(parts[parts.Length - 2], out guid))
+            return true;
+        guid = Guid.Empty;
+        return false;
+    }
+
+    private IResponseMessage MappingEnable(HttpContext _, IRequestMessage requestMessage)
+    {
+        if (TryParseGuidFromSecondToLastSegment(requestMessage, out var guid))
+        {
+            var mapping = Mappings.FirstOrDefault(m => !m.IsAdminInterface && m.Guid == guid);
+            if (mapping != null)
+            {
+                mapping.IsDisabled = false;
+                return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping enabled", guid);
+            }
+        }
+
+        _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
+        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+    }
+
+    private IResponseMessage MappingDisable(HttpContext _, IRequestMessage requestMessage)
+    {
+        if (TryParseGuidFromSecondToLastSegment(requestMessage, out var guid))
+        {
+            var mapping = Mappings.FirstOrDefault(m => !m.IsAdminInterface && m.Guid == guid);
+            if (mapping != null)
+            {
+                mapping.IsDisabled = true;
+                return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping disabled", guid);
+            }
+        }
+
+        _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
+        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+    }
     #endregion Mapping/{guid}
 
     #region Mappings

src/WireMock.Net.Minimal/Server/WireMockServer.ConvertMapping.cs

@@ -120,6 +120,11 @@ public partial class WireMockServer
             respondProvider.WithProbability(mappingModel.Probability.Value);
         }
 
+        if (mappingModel.IsDisabled == true)
+        {
+            respondProvider.WithIsDisabled(true);
+        }
+
         // ProtoDefinition is defined at Mapping level
         if (mappingModel.ProtoDefinition != null)
         {
@@ -263,6 +268,8 @@ public partial class WireMockServer
             }
         }
 
+        requestBuilder = requestBuilder.WithEarlyMismatch(requestModel.EarlyMatcherType);
+
         return requestBuilder;
     }
 

src/WireMock.Net.Minimal/Server/WireMockServer.cs

@@ -414,6 +414,7 @@ public partial class WireMockServer : IWireMockServer
         _options.CorsPolicyOptions = _settings.CorsPolicyOptions;
         _options.ClientCertificateMode = (Microsoft.AspNetCore.Server.Kestrel.Https.ClientCertificateMode)_settings.ClientCertificateMode;
         _options.AcceptAnyClientCertificate = _settings.AcceptAnyClientCertificate;
+        _options.DefaultJsonSerializer = _settings.DefaultJsonSerializer;
 
         _httpServer = new AspNetCoreSelfHost(_options, urlOptions);
         var startTask = _httpServer.StartAsync();

src/WireMock.Net.NUnit/WireMock.Net.NUnit.csproj

@@ -25,7 +25,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.8.0" />
+        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.9.0" />
         <PackageReference Include="NUnit" Version="4.4.0" />
         <PackageReference Include="Stef.Validation" Version="0.2.0" />
     </ItemGroup>

src/WireMock.Net.OpenTelemetry/WireMock.Net.OpenTelemetry.csproj

@@ -25,9 +25,9 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.3" />
-        <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.15.2" />
-        <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.14.0" />
+        <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.15.3" />
     </ItemGroup>
 
     <ItemGroup>

src/WireMock.Net.RestClient/IWireMockAdminApi.cs

@@ -163,6 +163,22 @@ public interface IWireMockAdminApi
     [Header("Content-Type", "application/json")]
     Task<StatusModel> PutMappingAsync([Path] Guid guid, [Body] MappingModel mapping, CancellationToken cancellationToken = default);
 
+    /// <summary>
+    /// Enable a mapping based on the guid.
+    /// </summary>
+    /// <param name="guid">The Guid.</param>
+    /// <param name="cancellationToken">The optional cancellationToken.</param>
+    [Put("mappings/{guid}/enable")]
+    Task<StatusModel> EnableMappingAsync([Path] Guid guid, CancellationToken cancellationToken = default);
+
+    /// <summary>
+    /// Disable a mapping based on the guid.
+    /// </summary>
+    /// <param name="guid">The Guid.</param>
+    /// <param name="cancellationToken">The optional cancellationToken.</param>
+    [Put("mappings/{guid}/disable")]
+    Task<StatusModel> DisableMappingAsync([Path] Guid guid, CancellationToken cancellationToken = default);
+
     /// <summary>
     /// Delete a mapping based on the guid
     /// </summary>

src/WireMock.Net.RestClient/WireMock.Net.RestClient.csproj

@@ -33,7 +33,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.8.0" />
+        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.9.0" />
         <PackageReference Include="RestEase" Version="1.6.4" />
         <PackageReference Include="Stef.Validation" Version="0.2.0" />
     </ItemGroup>

src/WireMock.Net.Shared/IMapping.cs

@@ -108,6 +108,14 @@ public interface IMapping
     /// </value>
     bool IsProxy { get; }
 
+    /// <summary>
+    /// Gets a value indicating whether this mapping is disabled.
+    /// </summary>
+    /// <value>
+    /// <c>true</c> if this mapping is disabled; otherwise, <c>false</c>.
+    /// </value>
+    bool IsDisabled { get; set; }
+
     /// <summary>
     /// Gets a value indicating whether this mapping to be logged.
     /// </summary>

src/WireMock.Net.Shared/Matchers/Request/RequestMessageGraphQLMatcher.cs

@@ -69,6 +69,9 @@ public class RequestMessageGraphQLMatcher : IRequestMatcher
         MatchOperator = matchOperator;
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.GraphQL;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Shared/Matchers/Request/RequestMessageProtoBufMatcher.cs

@@ -30,6 +30,9 @@ public class RequestMessageProtoBufMatcher : IRequestMatcher
         }
     }
 
+    /// <inheritdoc />
+    public RequestMatcherType Type => RequestMatcherType.ProtoBuf;
+
     /// <inheritdoc />
     public double GetMatchingScore(IRequestMessage requestMessage, IRequestMatchResult requestMatchResult)
     {

src/WireMock.Net.Shared/RequestBuilders/IRequestBuilder.cs

@@ -10,7 +10,8 @@ namespace WireMock.RequestBuilders;
 public interface IRequestBuilder : IClientIPRequestBuilder
 {
     /// <summary>
-    /// Adds a request matcher to the builder.
+    /// Adds a request matcher to the builder.<br/>
+    /// If the request matcher is already present, it will be replaced.
     /// </summary>
     /// <typeparam name="T">The type of the request matcher.</typeparam>
     /// <param name="requestMatcher">The request matcher to add.</param>
@@ -21,4 +22,11 @@ public interface IRequestBuilder : IClientIPRequestBuilder
     /// The link back to the Mapping.
     /// </summary>
     IMapping Mapping { get; set; }
+
+    /// <summary>
+    /// Chooses the <see cref="IRequestMatcher"/> which immediately returns a mismatch during mappings enumeration.
+    /// </summary>
+    /// <param name="earlyMatcherType">Selected type to choose the matcher from available list.</param>
+    /// <returns>The current <see cref="IRequestBuilder"/> instance.</returns>
+    IRequestBuilder WithEarlyMismatch(RequestMatcherType? earlyMatcherType);
 }

src/WireMock.Net.Shared/WireMock.Net.Shared.csproj

@@ -30,7 +30,7 @@
         <PackageReference Include="Stef.Validation" Version="0.2.0" />
         <PackageReference Include="AnyOf" Version="0.5.0.1" />
         <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="8.0.2" />
-        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.8.0" />
+        <PackageReference Include="JsonConverter.Newtonsoft.Json" Version="0.9.0" />
     </ItemGroup>
 
     <ItemGroup>

test/WireMock.Net.Tests/AdminApi/WireMockAdminApiTests.IsDisabled.cs

@@ -0,0 +1,134 @@
+// Copyright © WireMock.Net
+
+using RestEase;
+using WireMock.Admin.Mappings;
+using WireMock.Client;
+using WireMock.Server;
+
+namespace WireMock.Net.Tests.AdminApi;
+
+public partial class WireMockAdminApiTests
+{
+    [Fact]
+    public async Task IWireMockAdminApi_PostMappingAsync_WithIsDisabledTrue_DoesNotMatchRequests()
+    {
+        // Arrange
+        var ct = TestContext.Current.CancellationToken;
+        using var server = WireMockServer.StartWithAdminInterface();
+        var api = RestClient.For<IWireMockAdminApi>(server.Urls[0]);
+        var httpClient = server.CreateClient();
+
+        var model = new MappingModel
+        {
+            Request = new RequestModel { Path = "/foo", Methods = ["GET"] },
+            Response = new ResponseModel { Body = "hello", StatusCode = 200 },
+            IsDisabled = true
+        };
+
+        // Act — POST the disabled mapping
+        var postResult = await api.PostMappingAsync(model, ct);
+        postResult.Should().NotBeNull();
+
+        // Assert — request should not be matched (404)
+        var response = await httpClient.GetAsync("/foo", ct);
+        ((int)response.StatusCode).Should().Be(404);
+
+        // Assert — mapping exists but IsDisabled is true
+        server.Mappings.Where(m => !m.IsAdminInterface).Should().ContainSingle(m => m.IsDisabled == true);
+    }
+
+    [Fact]
+    public async Task IWireMockAdminApi_DisableMappingAsync_PreventsMatching()
+    {
+        // Arrange
+        var ct = TestContext.Current.CancellationToken;
+        using var server = WireMockServer.StartWithAdminInterface();
+        var api = RestClient.For<IWireMockAdminApi>(server.Urls[0]);
+        var httpClient = server.CreateClient();
+
+        var model = new MappingModel
+        {
+            Request = new RequestModel { Path = "/bar", Methods = ["GET"] },
+            Response = new ResponseModel { Body = "world", StatusCode = 200 }
+        };
+        var postResult = await api.PostMappingAsync(model, ct);
+        var guid = postResult.Guid!.Value;
+
+        // Assert — mapping matches before disable
+        var before = await httpClient.GetAsync("/bar", ct);
+        ((int)before.StatusCode).Should().Be(200);
+
+        // Act — disable
+        var disableResult = await api.DisableMappingAsync(guid, ct);
+        disableResult.Status.Should().Be("Mapping disabled");
+
+        // Assert — no match after disable
+        var after = await httpClient.GetAsync("/bar", ct);
+        ((int)after.StatusCode).Should().Be(404);
+    }
+
+    [Fact]
+    public async Task IWireMockAdminApi_EnableMappingAsync_ResumesMatching()
+    {
+        // Arrange
+        var ct = TestContext.Current.CancellationToken;
+        using var server = WireMockServer.StartWithAdminInterface();
+        var api = RestClient.For<IWireMockAdminApi>(server.Urls[0]);
+        var httpClient = server.CreateClient();
+
+        var model = new MappingModel
+        {
+            Request = new RequestModel { Path = "/baz", Methods = ["GET"] },
+            Response = new ResponseModel { Body = "re-enabled", StatusCode = 200 },
+            IsDisabled = true
+        };
+        var postResult = await api.PostMappingAsync(model, ct);
+        var guid = postResult.Guid!.Value;
+
+        // Assert — no match while disabled
+        var before = await httpClient.GetAsync("/baz", ct);
+        ((int)before.StatusCode).Should().Be(404);
+
+        // Act — enable
+        var enableResult = await api.EnableMappingAsync(guid, ct);
+        enableResult.Status.Should().Be("Mapping enabled");
+
+        // Assert — mapping matches after enable
+        var after = await httpClient.GetAsync("/baz", ct);
+        ((int)after.StatusCode).Should().Be(200);
+    }
+
+    [Fact]
+    public async Task IWireMockAdminApi_GetMappingAsync_ReturnsIsDisabledTrue_WhenDisabled()
+    {
+        // Arrange
+        var ct = TestContext.Current.CancellationToken;
+        using var server = WireMockServer.StartWithAdminInterface();
+        var api = RestClient.For<IWireMockAdminApi>(server.Urls[0]);
+
+        var disabledModel = new MappingModel
+        {
+            Request = new RequestModel { Path = "/check-disabled" },
+            Response = new ResponseModel { Body = "x", StatusCode = 200 },
+            IsDisabled = true
+        };
+        var enabledModel = new MappingModel
+        {
+            Request = new RequestModel { Path = "/check-enabled" },
+            Response = new ResponseModel { Body = "y", StatusCode = 200 }
+        };
+
+        var disabledPost = await api.PostMappingAsync(disabledModel, ct);
+        var enabledPost = await api.PostMappingAsync(enabledModel, ct);
+
+        // Act
+        var disabledGot = await api.GetMappingAsync(disabledPost.Guid!.Value, ct);
+        var enabledGot = await api.GetMappingAsync(enabledPost.Guid!.Value, ct);
+
+        // Assert — disabled mapping serializes IsDisabled = true
+        disabledGot.IsDisabled.Should().BeTrue();
+
+        // Assert — enabled mapping omits IsDisabled (null = default not disabled)
+        enabledGot.IsDisabled.Should().BeNull();
+    }
+}

test/WireMock.Net.Tests/Constants.cs

@@ -6,5 +6,5 @@ internal static class Constants
 {
     internal const int NumStaticMappings = 10;
 
-    internal const int NumAdminMappings = 37;
+    internal const int NumAdminMappings = 39;
 }

test/WireMock.Net.Tests/Grpc/WireMockServerTests.Grpc.cs

@@ -8,8 +8,11 @@ using ExampleIntegrationTest.Lookup;
 using Google.Protobuf.WellKnownTypes;
 using Greet;
 using Grpc.Net.Client;
+using Moq;
 using WireMock.Constants;
 using WireMock.Matchers;
+using WireMock.Matchers.Request;
+using WireMock.Net.Xunit;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
@@ -731,6 +734,93 @@ message Other {
         Then_ReplyMessage_Should_BeCorrect(reply);
     }
 
+    [Theory]
+    [InlineData(true)]
+    [InlineData(false)]
+    public async Task WireMockServer_WithBodyAsProtoBuf_WithEarlyMismatch_ErrorLogs_Issue1442(
+        bool withEarlyMismatch)
+    {
+        // Arrange
+        var greeterId = $"test-greeter-{Guid.NewGuid()}";
+        var policyId = $"test-policy-{Guid.NewGuid()}";
+        var ct = TestContext.Current.CancellationToken;
+
+        var greeterProtoDefinition = ProtoDefinition;
+        var policyProtoDefinition = File.ReadAllText("./Grpc/policy.proto");
+
+        var mockTestOutputHelper = new Mock<ITestOutputHelper>();
+        using var server = WireMockServer.Start(new WireMockServerSettings
+        {
+            UseHttp2 = true,
+            Logger = new TestOutputHelperWireMockLogger(mockTestOutputHelper.Object)
+        });
+
+        server
+            .AddProtoDefinition(greeterId, greeterProtoDefinition)
+            .Given(Request.Create()
+                .UsingPost()
+                .WithHttpVersion("2")
+                .WithPath("/greet.Greeter/SayHello")
+                .WithEarlyMismatch(withEarlyMismatch
+                    ? RequestMatcherType.Path
+                    : null)
+                .WithBodyAsProtoBuf("greet.HelloRequest", new JsonMatcher(new { name = "stef" })))
+            .WithProtoDefinition(greeterId)
+            .RespondWith(Response.Create()
+                .WithHeader("Content-Type", "application/grpc")
+                .WithTrailingHeader("grpc-status", "0")
+                .WithBodyAsProtoBuf("greet.HelloReply",
+                    new
+                    {
+                        message = "hello {{request.BodyAsJson.name}} {{request.method}}"
+                    })
+                .WithTransformer());
+
+        server
+            .AddProtoDefinition(policyId, policyProtoDefinition)
+            .Given(Request.Create()
+                .UsingPost()
+                .WithHttpVersion("2")
+                .WithPath("/Policy.PolicyService/GetVersion")
+                .WithEarlyMismatch(withEarlyMismatch
+                    ? RequestMatcherType.Path
+                    : null)
+                .WithBodyAsProtoBuf("ExampleIntegrationTest.Lookup.GetVersionRequest", new NotNullOrEmptyMatcher()))
+            .WithProtoDefinition(policyId)
+            .RespondWith(Response.Create()
+                .WithHeader("Content-Type", "application/grpc")
+                .WithTrailingHeader("grpc-status", "0")
+                .WithBodyAsProtoBuf("ExampleIntegrationTest.Lookup.GetVersionResponse",
+                    new GetVersionResponse
+                    {
+                        Version = "test",
+                        DateHired = new Timestamp
+                        {
+                            Seconds = 1722301323,
+                            Nanos = 12300
+                        },
+                        Client = new ExampleIntegrationTest.Lookup.Client
+                        {
+                            ClientName = ExampleIntegrationTest.Lookup.Client.Types.Clients.Test,
+                            CorrelationId = "correlation"
+                        }
+                    })
+                .WithTransformer());
+
+        // Act
+        var channel = GrpcChannel.ForAddress(server.Url!);
+        var policyServiceClient = new PolicyService.PolicyServiceClient(channel);
+        var greeterClient = new Greeter.GreeterClient(channel);
+
+        _ = await policyServiceClient.GetVersionAsync(new GetVersionRequest(), cancellationToken: ct);
+        _ = await greeterClient.SayHelloAsync(new HelloRequest { Name = "stef" }, cancellationToken: ct);
+
+        mockTestOutputHelper.Verify(
+            x => x.WriteLine(
+                It.Is<string>(log => log.Contains("[Error]") && log.Contains("Exception"))),
+            withEarlyMismatch ? Times.Never : Times.AtLeastOnce);
+    }
+
     private static WireMockServer Given_When_ServerStarted_And_RunningOnHttpAndGrpc()
     {
         var settings = new WireMockServerSettings

test/WireMock.Net.Tests/Owin/Mappers/OwinResponseMapperTests.cs

@@ -9,6 +9,8 @@ using WireMock.Util;
 using WireMock.Owin;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Primitives;
+using JsonConverter.Newtonsoft.Json;
+using JsonConverter.System.Text.Json;
 
 namespace WireMock.Net.Tests.Owin.Mappers;
 
@@ -34,6 +36,7 @@ public class OwinResponseMapperTests
         _optionsMock = new Mock<IWireMockMiddlewareOptions>();
         _optionsMock.SetupAllProperties();
         _optionsMock.SetupGet(o => o.FileSystemHandler).Returns(_fileSystemHandlerMock.Object);
+        _optionsMock.SetupGet(o => o.DefaultJsonSerializer).Returns(new NewtonsoftJsonConverter());
 
         _headers = new Mock<IHeaderDictionary>();
         _headers.SetupAllProperties();
@@ -186,7 +189,7 @@ public class OwinResponseMapperTests
     }
 
     [Fact]
-    public async Task OwinResponseMapper_MapAsync_BodyAsJson()
+    public async Task OwinResponseMapper_MapAsync_BodyAsJson_UsingNewtonsoftJson()
     {
         // Arrange
         var json = new { t = "x", i = (string?)null };
@@ -203,6 +206,25 @@ public class OwinResponseMapperTests
         _stream.Verify(s => s.WriteAsync(new byte[] { 123, 34, 116, 34, 58, 34, 120, 34, 125 }, 0, 9, It.IsAny<CancellationToken>()), Times.Once);
     }
 
+    [Fact]
+    public async Task OwinResponseMapper_MapAsync_BodyAsJson_UsingSystemTextJson()
+    {
+        // Arrange
+        var json = new { t = "x", i = (string?)null };
+        var responseMessage = new ResponseMessage
+        {
+            Headers = new Dictionary<string, WireMockList<string>>(),
+            BodyData = new BodyData { DetectedBodyType = BodyType.Json, BodyAsJson = json, BodyAsJsonIndented = false }
+        };
+        _optionsMock.SetupGet(o => o.DefaultJsonSerializer).Returns(new SystemTextJsonConverter());
+
+        // Act
+        await _sut.MapAsync(responseMessage, _responseMock.Object);
+
+        // Assert
+        _stream.Verify(s => s.WriteAsync(new byte[] { 123, 34, 116, 34, 58, 34, 120, 34, 125 }, 0, 9, It.IsAny<CancellationToken>()), Times.Once);
+    }
+
     [Fact]
     public async Task OwinResponseMapper_MapAsync_SetResponseHeaders()
     {

test/WireMock.Net.Tests/Owin/MappingMatcherTests.cs

@@ -56,6 +56,7 @@ public class MappingMatcherTests
     {
         // Assign
         var mappingMock = new Mock<IMapping>();
+        mappingMock.SetupGet(m => m.IsDisabled).Returns(false);
         mappingMock.Setup(m => m.GetRequestMatchResult(It.IsAny<RequestMessage>(), It.IsAny<string>())).Throws<Exception>();
 
         var mappings = new ConcurrentDictionary<Guid, IMapping>();
@@ -229,6 +230,35 @@ public class MappingMatcherTests
         result.Match!.Mapping.Guid.Should().Be(withProbability);
     }
 
+    [Fact]
+    public void MappingMatcher_FindBestMatch_WhenMappingIsDisabled_ShouldReturnNull()
+    {
+        // Assign
+        var guid = Guid.Parse("00000000-0000-0000-0000-000000000001");
+        var mappingMock = new Mock<IMapping>();
+        mappingMock.SetupGet(m => m.Guid).Returns(guid);
+        mappingMock.SetupGet(m => m.IsDisabled).Returns(true);
+        mappingMock.SetupGet(m => m.Probability).Returns((double?)null);
+
+        var matchResult = new RequestMatchResult();
+        matchResult.AddScore(typeof(object), 1.0, null);
+        mappingMock.Setup(m => m.GetRequestMatchResult(It.IsAny<RequestMessage>(), It.IsAny<string>())).Returns(matchResult);
+
+        var mappings = new ConcurrentDictionary<Guid, IMapping>();
+        mappings.TryAdd(guid, mappingMock.Object);
+        _optionsMock.Setup(o => o.Mappings).Returns(mappings);
+
+        var request = new RequestMessage(new UrlDetails("http://localhost/foo"), "GET", "::1");
+
+        // Act
+        var result = _sut.FindBestMatch(request);
+
+        // Assert
+        result.Match.Should().BeNull();
+        result.Partial.Should().BeNull();
+        mappingMock.Verify(m => m.GetRequestMatchResult(It.IsAny<RequestMessage>(), It.IsAny<string>()), Times.Never);
+    }
+
     private static ConcurrentDictionary<Guid, IMapping> InitMappings(params (Guid guid, double[] scores, double? probability)[] matches)
     {
         var mappings = new ConcurrentDictionary<Guid, IMapping>();
@@ -237,6 +267,7 @@ public class MappingMatcherTests
         {
             var mappingMock = new Mock<IMapping>();
             mappingMock.SetupGet(m => m.Guid).Returns(match.guid);
+            mappingMock.SetupGet(m => m.IsDisabled).Returns(false);
 
             var requestMatchResult = new RequestMatchResult();
             foreach (var score in match.scores)

test/WireMock.Net.Tests/RequestMatchers/RequestMessageCompositeMatcherTests.cs

@@ -1,8 +1,11 @@
 // Copyright © WireMock.Net
 
 using Moq;
+using WireMock.Constants;
+using WireMock.Matchers;
 using WireMock.Matchers.Request;
 using WireMock.Models;
+using WireMock.RequestBuilders;
 
 namespace WireMock.Net.Tests.RequestMatchers;
 
@@ -10,8 +13,12 @@ public class RequestMessageCompositeMatcherTests
 {
     private class Helper : RequestMessageCompositeMatcher
     {
-        public Helper(IEnumerable<IRequestMatcher> requestMatchers, CompositeMatcherType type = CompositeMatcherType.And) : base(requestMatchers, type)
+        public Helper(
+            IEnumerable<IRequestMatcher> requestMatchers,
+            CompositeMatcherType type = CompositeMatcherType.And,
+            RequestMatcherType? earlyMatcherType = null) : base(requestMatchers, type)
         {
+            EarlyMatcherType = earlyMatcherType;
         }
     }
 
@@ -77,4 +84,74 @@ public class RequestMessageCompositeMatcherTests
         requestMatcher1Mock.Verify(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>()), Times.Once);
         requestMatcher2Mock.Verify(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>()), Times.Once);
     }
+
+    [Fact]
+    public void RequestMessageCompositeMatcher_GetMatchingScore_EarlyMismatch()
+    {
+        // Assign
+        var requestMatcher1Mock = new Mock<IRequestMatcher>();
+        requestMatcher1Mock.Setup(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>())).Returns(1.0d);
+        var requestMatcher2Mock = new Mock<IRequestMatcher>();
+        requestMatcher2Mock.Setup(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>())).Returns(0.8d);
+        var postMatcher = new RequestMessageMethodMatcher(HttpRequestMethod.POST);
+
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost"), HttpRequestMethod.GET, "127.0.0.1");
+        var matcher = new Helper(
+            [requestMatcher1Mock.Object, requestMatcher2Mock.Object, postMatcher],
+            earlyMatcherType: RequestMatcherType.Method);
+
+        // Act
+        var result = new RequestMatchResult();
+        double score = matcher.GetMatchingScore(requestMessage, result);
+
+        // Assert
+        score.Should().Be(0.0d);
+
+        // Verify
+        requestMatcher1Mock.Verify(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>()), Times.Never);
+        requestMatcher2Mock.Verify(rm => rm.GetMatchingScore(It.IsAny<RequestMessage>(), It.IsAny<RequestMatchResult>()), Times.Never);
+    }
+
+    [Fact]
+    public void RequestMessageCompositeMatcher_GetMatchingScore_SeveralHeadersEarlyMismatch()
+    {
+        // Assign
+        var headers = new Dictionary<string, string[]>
+        {
+            { "teST", new[] { "x" } },
+            { "teST2", new[] { "z" } }
+        };
+        var requestMessage = new RequestMessage(new UrlDetails("http://localhost"), "GET", "127.0.0.1", null, headers);
+        var request = Request.Create()
+            .WithEarlyMismatch(RequestMatcherType.Header)
+            .UsingAnyMethod()
+            .WithHeader("teST", "x")
+            .WithHeader("teST1", ["xx", "yy"])
+            .WithHeader("teST2", ["y", "z"], matchOperator: MatchOperator.And);
+
+        // Act
+        var score = request.GetMatchingScore(requestMessage, new RequestMatchResult());
+
+        // Assert
+        score.Should().Be(0.0d);
+    }
+
+    [Fact]
+    public void RequestMessageCompositeMatcher_GetMatchingScore_SeveralParamEarlyMismatchSuccess()
+    {
+        // Assign
+        var uriWithParams = new Uri("http://localhost?test1=1&test2=2");
+        var requestMessage = new RequestMessage(new UrlDetails(uriWithParams), "GET", "127.0.0.1");
+        var request = Request.Create()
+            .WithEarlyMismatch(RequestMatcherType.Param)
+            .UsingAnyMethod()
+            .WithParam("test1", "1")
+            .WithParam("test2", "2");
+
+        // Act
+        var score = request.GetMatchingScore(requestMessage, new RequestMatchResult());
+
+        // Assert
+        score.Should().Be(1.0d);
+    }
 }

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToCSharpCode.cs

@@ -1,5 +1,6 @@
 // Copyright © WireMock.Net
 
+using WireMock.Matchers.Request;
 using WireMock.Net.Tests.VerifyExtensions;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
@@ -101,6 +102,7 @@ public partial class MappingConverterTests
         var guid = new Guid("8e7b9ab7-e18e-4502-8bc9-11e6679811cc");
         var request = Request.Create()
             .UsingGet()
+            .WithEarlyMismatch(RequestMatcherType.Method)
             .WithPath("/test_path")
             .WithParam("q", "42")
             .WithClientIP("112.123.100.99")

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToCSharpCode_With_Builder_And_AddStartIsFalse.verified.txt

@@ -1,5 +1,6 @@
 builder
     .Given(Request.Create()
+        .WithEarlyMismatch(WireMock.Matchers.Request.RequestMatcherType.Method)
         .UsingMethod("GET")
         .WithPath(new WildcardMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, "/test_path", false, WireMock.Matchers.MatchOperator.Or))
         .WithParam("q", new ExactMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, false, WireMock.Matchers.MatchOperator.And, "42"))

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToCSharpCode_With_Builder_And_AddStartIsTrue.verified.txt

@@ -1,6 +1,7 @@
 var builder = new MappingBuilder();
 builder
     .Given(Request.Create()
+        .WithEarlyMismatch(WireMock.Matchers.Request.RequestMatcherType.Method)
         .UsingMethod("GET")
         .WithPath(new WildcardMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, "/test_path", false, WireMock.Matchers.MatchOperator.Or))
         .WithParam("q", new ExactMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, false, WireMock.Matchers.MatchOperator.And, "42"))

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToCSharpCode_With_Server_And_AddStartIsFalse.verified.txt

@@ -1,5 +1,6 @@
 server
     .Given(Request.Create()
+        .WithEarlyMismatch(WireMock.Matchers.Request.RequestMatcherType.Method)
         .UsingMethod("GET")
         .WithPath(new WildcardMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, "/test_path", false, WireMock.Matchers.MatchOperator.Or))
         .WithParam("q", new ExactMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, false, WireMock.Matchers.MatchOperator.And, "42"))

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToCSharpCode_With_Server_And_AddStartIsTrue.verified.txt

@@ -1,6 +1,7 @@
 var server = WireMockServer.Start();
 server
     .Given(Request.Create()
+        .WithEarlyMismatch(WireMock.Matchers.Request.RequestMatcherType.Method)
         .UsingMethod("GET")
         .WithPath(new WildcardMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, "/test_path", false, WireMock.Matchers.MatchOperator.Or))
         .WithParam("q", new ExactMatcher(WireMock.Matchers.MatchBehaviour.AcceptOnMatch, false, WireMock.Matchers.MatchOperator.And, "42"))

test/WireMock.Net.Tests/Serialization/MappingConverterTests.ToMappingModel_Request_WithEarlyMismatch_ReturnsCorrectModel.verified.txt

@@ -0,0 +1,34 @@
+{
+  Guid: Guid_1,
+  UpdatedAt: DateTime_1,
+  Title: ,
+  Description: ,
+  Priority: 42,
+  Request: {
+    Path: {
+      Matchers: [
+        {
+          Name: WildcardMatcher,
+          Pattern: 1.2.3.4,
+          IgnoreCase: false
+        }
+      ]
+    },
+    Headers: [
+      {
+        Name: x1,
+        Matchers: [
+          {
+            Name: WildcardMatcher,
+            Pattern: y,
+            IgnoreCase: true
+          }
+        ],
+        IgnoreCase: true
+      }
+    ],
+    EarlyMatcherType: ClientIP
+  },
+  Response: {},
+  UseWebhooksFireAndForget: false
+}

test/WireMock.Net.Tests/Serialization/MappingConverterTests.cs

@@ -1,6 +1,7 @@
 // Copyright © WireMock.Net
 
 using WireMock.Matchers;
+using WireMock.Matchers.Request;
 using WireMock.Models;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
@@ -640,4 +641,25 @@ message HelloReply {
         // Verify
         return Verify(model);
     }
+
+    [Fact]
+    public Task ToMappingModel_Request_WithEarlyMismatch_ReturnsCorrectModel()
+    {
+        // Arrange
+        var request = Request.Create().WithEarlyMismatch(RequestMatcherType.ClientIP)
+            .WithHeader("x1", "y")
+            .WithClientIP("1.2.3.4");
+        var response = Response.Create();
+        var mapping = new Mapping(_guid, _updatedAt, string.Empty, string.Empty, null, _settings, request, response, 42, null, null, null, null, null, false, null, null);
+
+        // Act
+        var model = _sut.ToMappingModel(mapping);
+
+        // Assert
+        model.Should().NotBeNull();
+        model.Request.EarlyMatcherType.Should().Be(RequestMatcherType.ClientIP);
+
+        // Verify
+        return Verify(model);
+    }
 }

test/WireMock.Net.Tests/Serialization/MappingSerializerTests.cs

@@ -3,6 +3,8 @@
 using JsonConverter.Newtonsoft.Json;
 using WireMock.Admin.Mappings;
 using WireMock.Serialization;
+using Newtonsoft.Json.Linq;
+
 #if NET8_0_OR_GREATER
 using JsonConverter.System.Text.Json;
 #endif
@@ -319,5 +321,92 @@ public class MappingSerializerTests
         act.Should().Throw<InvalidOperationException>()
             .WithMessage("Cannot deserialize the provided value to an array or object.");
     }
+
+    [Fact]
+    public void MappingSerializer_DeserializeJsonToArray_WithNewtonsoftJson_DateTimeStringInQueryParamExactMatcherPattern_ShouldPreservePatternAsString()
+    {
+        // Arrange
+        var jsonConverter = new NewtonsoftJsonConverter();
+        var serializer = new MappingSerializer(jsonConverter);
+        var mappingJson =
+            """
+            {
+                "Guid": "12345678-1234-1234-1234-aaaaaaaaaaaa",
+                "Request": {
+                    "Path": "/api/report",
+                    "Methods": ["GET"],
+                    "Params": [
+                        {
+                            "Name": "asOfDate",
+                            "Matchers": [
+                                {
+                                    "Name": "ExactMatcher",
+                                    "Pattern": "2021-11-10T13:39:13.705"
+                                }
+                            ]
+                        }
+                    ]
+                },
+                "Response": {
+                    "StatusCode": 200
+                }
+            }
+            """;
+
+        // Act
+        var result = serializer.DeserializeJsonToArray<MappingModel>(mappingJson);
+
+        // Assert
+        result.Should().HaveCount(1);
+        var matcher = result[0].Request!.Params![0].Matchers![0];
+        matcher.Name.Should().Be("ExactMatcher");
+        matcher.Pattern.Should().BeOfType<string>()
+            .Which.Should().Be("2021-11-10T13:39:13.705",
+                "datetime-format strings in ExactMatcher Pattern fields must survive deserialization as strings, " +
+                "not be auto-converted to DateTime by Newtonsoft.Json's DateParseHandling.DateTime");
+    }
+
+    [Fact]
+    public void MappingSerializer_DeserializeJsonToArray_WithNewtonsoftJson_DateTimeStringInJsonMatcherBodyPattern_ShouldPreservePatternAsString()
+    {
+        // Arrange
+        var jsonConverter = new NewtonsoftJsonConverter();
+        var serializer = new MappingSerializer(jsonConverter);
+        // Pattern is an INLINE JSON object (not a string) - this is how WireMock mapping files store
+        // JsonMatcher patterns when recorded. Newtonsoft with DateParseHandling.DateTime will convert
+        // the datetime value inside the JObject to JTokenType.Date during deserialization.
+        var mappingJson =
+            """
+            {
+                "Guid": "12345678-1234-1234-1234-bbbbbbbbbbbb",
+                "Request": {
+                    "Path": "/api/report",
+                    "Methods": ["POST"],
+                    "Body": {
+                        "Matcher": {
+                            "Name": "JsonMatcher",
+                            "Pattern": {"Date": "2021-09-30T00:00:00Z", "Names": ["Cash"]}
+                        }
+                    }
+                },
+                "Response": {
+                    "StatusCode": 200
+                }
+            }
+            """;
+
+        // Act
+        var result = serializer.DeserializeJsonToArray<MappingModel>(mappingJson);
+
+        // Assert - datetime values inside the JObject pattern must remain JTokenType.String.
+        result.Should().HaveCount(1);
+        var matcher = result[0].Request!.Body!.Matcher!;
+        matcher.Name.Should().Be("JsonMatcher");
+        var patternJObject = matcher.Pattern.Should().BeOfType<JObject>().Subject;
+        patternJObject["Date"]!.Type.Should().Be(JTokenType.String,
+            "datetime-format strings inside an inline JsonMatcher body pattern must retain JTokenType.String " +
+            "after deserialization; if DateParseHandling.DateTime auto-converts them to JTokenType.Date, " +
+            "JToken.DeepEquals will fail against incoming request bodies parsed with DateParseHandling.None");
+    }
 #endif
 }

test/WireMock.Net.Tests/StatefulBehaviorTests.cs

@@ -413,6 +413,120 @@ public class StatefulBehaviorTests
         action.Should().ThrowAsync<HttpRequestException>();
     }
 
+    [Fact]
+    public async Task Scenarios_FirstRequestWithDelay_StateTransitions_BeforeDelayCompletes()
+    {
+        // Arrange
+        var cancellationToken = TestContext.Current.CancellationToken;
+        var path = $"/foo_{Guid.NewGuid()}";
+        using var server = WireMockServer.Start();
+
+        // Mapping 1: start state, has a 500 ms delay
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("1260")
+            .WillSetStateTo("State1")
+            .RespondWith(Response.Create()
+                .WithBody("delayed response")
+                .WithDelay(TimeSpan.FromMilliseconds(500)));
+
+        // Mapping 2: only matches after state has transitioned to "State1"
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("1260")
+            .WhenStateIs("State1")
+            .RespondWith(Response.Create().WithBody("immediate response"));
+
+        var client = new HttpClient();
+
+        // Act: fire request 1 but don't await it yet — it will sit in a 500 ms delay
+        var request1Task = client.GetStringAsync(server.Url + path, cancellationToken);
+
+        // Give the server a moment to match & transition state before the delay completes
+        await Task.Delay(100, cancellationToken);
+
+        // Request 2 is sent while request 1 is still being delayed.
+        // After the fix the state has already transitioned, so request 2 matches Mapping 2.
+        var response2 = await client.GetStringAsync(server.Url + path, cancellationToken);
+
+        var response1 = await request1Task;
+
+        // Assert
+        response1.Should().Be("delayed response");
+        response2.Should().Be("immediate response");
+    }
+
+    [Fact]
+    public async Task Scenarios_WithGlobalRequestProcessingDelay_StateTransitions_BeforeDelayCompletes()
+    {
+        // Arrange: use the global RequestProcessingDelay instead of a per-mapping delay
+        var cancellationToken = TestContext.Current.CancellationToken;
+        var path = $"/foo_{Guid.NewGuid()}";
+        using var server = WireMockServer.Start();
+        server.AddGlobalProcessingDelay(TimeSpan.FromMilliseconds(500));
+
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("s")
+            .WillSetStateTo("State1")
+            .RespondWith(Response.Create().WithBody("delayed response"));
+
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("s")
+            .WhenStateIs("State1")
+            .RespondWith(Response.Create().WithBody("immediate response"));
+
+        var client = new HttpClient();
+
+        // Act
+        var request1Task = client.GetStringAsync(server.Url + path, cancellationToken);
+        await Task.Delay(100, cancellationToken);
+        var response2 = await client.GetStringAsync(server.Url + path, cancellationToken);
+        var response1 = await request1Task;
+
+        // Assert
+        response1.Should().Be("delayed response");
+        response2.Should().Be("immediate response");
+    }
+
+    [Fact]
+    public async Task Scenarios_WithDelay_And_TimesInSameState_Should_Transition_After_Required_Hits()
+    {
+        // Arrange
+        var cancellationToken = TestContext.Current.CancellationToken;
+        var path = $"/foo_{Guid.NewGuid()}";
+        using var server = WireMockServer.Start();
+
+        // Mapping 1: requires 2 hits before transitioning; has a short delay
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("s")
+            .WillSetStateTo("State1", 2)
+            .RespondWith(Response.Create()
+                .WithBody("first")
+                .WithDelay(TimeSpan.FromMilliseconds(50)));
+
+        // Mapping 2: matches after state is "State1"
+        server
+            .Given(Request.Create().WithPath(path).UsingGet())
+            .InScenario("s")
+            .WhenStateIs("State1")
+            .RespondWith(Response.Create().WithBody("second"));
+
+        var client = new HttpClient();
+
+        // Act
+        var response1 = await client.GetStringAsync(server.Url + path, cancellationToken);
+        var response2 = await client.GetStringAsync(server.Url + path, cancellationToken);
+        var response3 = await client.GetStringAsync(server.Url + path, cancellationToken);
+
+        // Assert: state only transitions after 2 hits, so request 3 is the first to match Mapping 2
+        response1.Should().Be("first");
+        response2.Should().Be("first");
+        response3.Should().Be("second");
+    }
+
     [Fact]
     public async Task Scenarios_Should_process_request_if_equals_state_and_multiple_state_defined()
     {

test/WireMock.Net.Tests/WireMockServerTests.WithBody.cs

@@ -4,10 +4,13 @@ using System.Net;
 using System.Net.Http;
 using System.Net.Http.Json;
 using System.Text;
+using System.Text.Json.Serialization;
+using JsonConverter.System.Text.Json;
 using WireMock.Matchers;
 using WireMock.RequestBuilders;
 using WireMock.ResponseBuilders;
 using WireMock.Server;
+using WireMock.Settings;
 
 namespace WireMock.Net.Tests;
 
@@ -18,11 +21,41 @@ public partial class WireMockServerTests
         public string? Hi { get; set; }
     }
 
+    public class Person
+    {
+        [JsonPropertyName("first_name")]
+        public string FirstName { get; set; } = string.Empty;
+
+        [JsonPropertyName("last_name")]
+        public string LastName { get; set; } = string.Empty;
+    }
+
+    [Fact]
+    public async Task WireMockServer_WithBodyAsJson_UsingWireMockServerSettings_SystemTextJsonConverter_ShouldReturnCorrectResponse()
+    {
+        // Arange
+        var person = new Person { FirstName = "John", LastName = "Smith" };
+
+        using var server = WireMockServer.Start(new WireMockServerSettings
+        {
+            DefaultJsonSerializer = new SystemTextJsonConverter()
+        });
+
+        // Act
+        server
+            .Given(Request.Create().UsingAnyMethod())
+            .RespondWith(Response.Create().WithBodyAsJson(person));
+
+        var response = await server.CreateClient().GetStringAsync("/", _ct);
+
+        // Assert
+        response.Should().BeEquivalentTo("{\"first_name\":\"John\",\"last_name\":\"Smith\"}");
+    }
+
     [Fact]
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_MultipleJmesPathMatchers_ShouldMatch()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
             Request.Create()
@@ -56,7 +89,7 @@ public partial class WireMockServerTests
         var requestUri = new Uri($"http://localhost:{server.Port}/a");
 
         var json = new { requestId = "1", value = "A" };
-        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json, cancellationToken);
+        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json, _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -68,7 +101,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_MultipleJmesPathMatchers_ShouldMatch_BestMatching()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
                 Request.Create()
@@ -105,7 +137,7 @@ public partial class WireMockServerTests
         var requestUri = new Uri($"http://localhost:{server.Port}/a");
 
         var json = new { extra = "X", requestId = "1", value = "A" };
-        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json, cancellationToken);
+        var response = await server.CreateClient().PostAsJsonAsync(requestUri, json, _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -117,7 +149,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsJsonAsync_And_WildcardMatcher_ShouldMatch()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
                 Request.Create().UsingPost().WithPath("/foo").WithBody(new WildcardMatcher("*Hello*"))
@@ -132,7 +163,7 @@ public partial class WireMockServerTests
         };
 
         // Act
-        var response = await new HttpClient().PostAsJsonAsync("http://localhost:" + server.Ports[0] + "/foo", jsonObject, cancellationToken);
+        var response = await new HttpClient().PostAsJsonAsync("http://localhost:" + server.Ports[0] + "/foo", jsonObject, _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -144,7 +175,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsync_And_WildcardMatcher_ShouldMatch()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
                 Request.Create().UsingPost().WithPath("/foo").WithBody(new WildcardMatcher("*Hello*"))
@@ -154,7 +184,7 @@ public partial class WireMockServerTests
             );
 
         // Act
-        var response = await new HttpClient().PostAsync("http://localhost:" + server.Ports[0] + "/foo", new StringContent("{ Hi = \"Hello World\" }"), cancellationToken);
+        var response = await new HttpClient().PostAsync("http://localhost:" + server.Ports[0] + "/foo", new StringContent("{ Hi = \"Hello World\" }"), _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -166,7 +196,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsync_And_JsonPartialWildcardMatcher_ShouldMatch()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
 
         var matcher = new JsonPartialWildcardMatcher(new { method = "initialize", id = "^[a-f0-9]{32}-[0-9]$" }, ignoreCase: true, regex: true);
@@ -188,13 +217,13 @@ public partial class WireMockServerTests
         // Act
         var content = "{\"jsonrpc\":\"2.0\",\"id\":\"ec475f56d4694b48bc737500ba575b35-1\",\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2024-11-05\",\"capabilities\":{},\"clientInfo\":{\"name\":\"GitHub Test\",\"version\":\"1.0.0\"}}}";
         var response = await new HttpClient()
-            .PostAsync($"{server.Url}/foo", new StringContent(content, Encoding.UTF8, "application/json"), cancellationToken)
+            .PostAsync($"{server.Url}/foo", new StringContent(content, Encoding.UTF8, "application/json"), _ct)
 ;
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
 
-        var responseText = await response.Content.ReadAsStringAsync(cancellationToken);
+        var responseText = await response.Content.ReadAsStringAsync(_ct);
         responseText.Should().Contain("ec475f56d4694b48bc737500ba575b35-1");
     }
 
@@ -203,8 +232,7 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsJson_Using_PostAsync_And_JsonPartialWildcardMatcher_And_SystemTextJson_ShouldMatch()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
+        using var server = WireMockServer.Start(x => x.DefaultJsonSerializer = new SystemTextJsonConverter());
-        using var server = WireMockServer.Start(x => x.DefaultJsonSerializer = new JsonConverter.System.Text.Json.SystemTextJsonConverter() );
 
         var matcher = new JsonPartialWildcardMatcher(new { id = "^[a-f0-9]{32}-[0-9]$" }, ignoreCase: true, regex: true);
         server.Given(Request.Create()
@@ -220,12 +248,12 @@ public partial class WireMockServerTests
         // Act
         var content = """{"id":"ec475f56d4694b48bc737500ba575b35-1"}""";
         using var httpClient = new HttpClient();
-        var response = await httpClient.PostAsync($"{server.Url}/system-text-json", new StringContent(content, Encoding.UTF8, "application/json"), cancellationToken);
+        var response = await httpClient.PostAsync($"{server.Url}/system-text-json", new StringContent(content, Encoding.UTF8, "application/json"), _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
 
-        var responseText = await response.Content.ReadAsStringAsync(cancellationToken);
+        var responseText = await response.Content.ReadAsStringAsync(_ct);
         responseText.Should().Contain("OK");
     }
 #endif
@@ -234,7 +262,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFunc()
     {
         // Arrange
-        var cancelationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
             Request.Create()
@@ -249,7 +276,7 @@ public partial class WireMockServerTests
         // Act
         var content = new FormUrlEncodedContent([new KeyValuePair<string, string>("key1", "value1")]);
         var response = await new HttpClient()
-            .PostAsync($"{server.Url}/foo", content, cancelationToken);
+            .PostAsync($"{server.Url}/foo", content, _ct);
 
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -261,7 +288,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithExactMatcher()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server.Given(
                 Request.Create()
@@ -282,7 +308,7 @@ public partial class WireMockServerTests
             new KeyValuePair<string, string>("email", "johndoe@example.com")
         ]);
         using var httpClient = new HttpClient();
-        var response = await httpClient.PostAsync($"{server.Url}/foo", content, cancellationToken)
+        var response = await httpClient.PostAsync($"{server.Url}/foo", content, _ct)
 ;
         // Assert
         response.StatusCode.Should().Be(HttpStatusCode.OK);
@@ -294,7 +320,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithBodyAsFormUrlEncoded_Using_PostAsync_And_WithFormUrlEncodedMatcher()
     {
         // Arrange
-        var cancelationToken = TestContext.Current.CancellationToken;
         var matcher = new FormUrlEncodedMatcher(["email=johndoe@example.com", "name=John Doe"]);
         using var server = WireMockServer.Start();
         server.Given(
@@ -326,7 +351,7 @@ public partial class WireMockServerTests
             new KeyValuePair<string, string>("email", "johndoe@example.com")
         ]);
         var responseOrdered = await new HttpClient()
-            .PostAsync($"{server.Url}/foo", contentOrdered, cancelationToken)
+            .PostAsync($"{server.Url}/foo", contentOrdered, _ct)
 ;
 
         // Assert 1
@@ -340,7 +365,7 @@ public partial class WireMockServerTests
             new KeyValuePair<string, string>("name", "John Doe"),
         ]);
         var responseUnordered = await new HttpClient()
-            .PostAsync($"{server.Url}/bar", contentUnordered, cancelationToken)
+            .PostAsync($"{server.Url}/bar", contentUnordered, _ct)
 ;
 
         // Assert 2
@@ -353,7 +378,6 @@ public partial class WireMockServerTests
     public async Task WireMockServer_WithSseBody()
     {
         // Arrange
-        var cancellationToken = TestContext.Current.CancellationToken;
         using var server = WireMockServer.Start();
         server
             .WhenRequest(r => r
@@ -387,9 +411,8 @@ public partial class WireMockServerTests
         using var client = new HttpClient();
 
         // Act 1
-        var normal = await client.GetAsync(server.Url, cancellationToken)
+        var normal = await client.GetAsync(server.Url, _ct);
-;
+        (await normal.Content.ReadAsStringAsync(_ct)).Should().Be("normal");
-        (await normal.Content.ReadAsStringAsync(cancellationToken)).Should().Be("normal");
 
         // Act 2
         using var response = await client.GetStreamAsync($"{server.Url}/sse", _ct);