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

CHANGELOG.md

@@ -1,3 +1,9 @@
+# 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)

Directory.Build.props

@@ -4,7 +4,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <VersionPrefix>2.4.0</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=2.4.0
+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

@@ -1,6 +1,7 @@
-# 2.4.0 (24 April 2026)
+# 2.5.0 (04 May 2026)
-- #1437 Added feature to enable and disable mappings [feature]
+- #1451 Feature/early mismatch [feature]
-- #1450 Bump OpenTelemetry.Exporter.OpenTelemetryProtocol from 1.14.0 to 1.15.x [dependencies, .NET]
+- #1452 Bump log4net from 2.0.15 to 3.3.0 in example console app [dependencies, .NET]
-- #1421 Deactivate mapping without deleting it [feature]
+- #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/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.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" />

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.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/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)
@@ -300,7 +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/Server/WireMockServer.ConvertMapping.cs

@@ -268,6 +268,8 @@ public partial class WireMockServer
             }
         }
 
+        requestBuilder = requestBuilder.WithEarlyMismatch(requestModel.EarlyMatcherType);
+
         return requestBuilder;
     }
 

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);
 }

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/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);
+    }
 }