2.6.0

* Fix response timestamp

* Extracted new interface to own file

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 2.6.0 (11 May 2026)
+- [#1455](https://github.com/wiremock/WireMock.Net/pull/1455) - Fix request storing when RequestLogExpirationDuration is set [bug]  [bug] contributed by [pbenko-xitaso](https://github.com/pbenko-xitaso)
+- [#1454](https://github.com/wiremock/WireMock.Net/issues/1454) - No requests stored in Standalone when RequestLogExpirationDuration is set [bug]
+
 # 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)

Directory.Build.props

@@ -4,7 +4,7 @@
     </PropertyGroup>
 
     <PropertyGroup>
-        <VersionPrefix>2.5.0</VersionPrefix>
+        <VersionPrefix>2.6.0</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=2.5.0
+SET version=2.6.0
 
 GitHubReleaseNotes --output CHANGELOG.md --skip-empty-releases --exclude-labels wontfix test question invalid doc duplicate example environment --version %version% --token %GH_TOKEN%
 

PackageReleaseNotes.txt

@@ -1,7 +1,5 @@
-# 2.5.0 (04 May 2026)
-- #1451 Feature/early mismatch [feature]
-- #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]
+# 2.6.0 (11 May 2026)
+- #1455 Fix request storing when RequestLogExpirationDuration is set [bug]  [bug]
+- #1454 No requests stored in Standalone when RequestLogExpirationDuration is set [bug]
 
 The full release notes can be found here: https://github.com/wiremock/WireMock.Net/blob/master/CHANGELOG.md

src/WireMock.Net.Minimal/IResponseMessageBuilder.cs

@@ -0,0 +1,16 @@
+// Copyright © WireMock.Net
+
+using System.Net;
+
+namespace WireMock;
+
+internal interface IResponseMessageBuilder
+{
+    ResponseMessage Create(HttpStatusCode statusCode, string? status, Guid? guid = null);
+
+    ResponseMessage Create(int statusCode, string? status, Guid? guid = null);
+
+    ResponseMessage Create(int statusCode, string? status, string? error, Guid? guid = null);
+
+    ResponseMessage Create(HttpStatusCode statusCode);
+}

src/WireMock.Net.Minimal/MappingBuilder.cs

@@ -27,6 +27,7 @@ public class MappingBuilder : IMappingBuilder
     private readonly MappingToFileSaver _mappingToFileSaver;
     private readonly IGuidUtils _guidUtils;
     private readonly IDateTimeUtils _dateTimeUtils;
+    private readonly IResponseMessageBuilder _responseMessageBuilder;
 
     /// <summary>
     /// Create a MappingBuilder
@@ -43,6 +44,7 @@ public class MappingBuilder : IMappingBuilder
 
         _guidUtils = new GuidUtils();
         _dateTimeUtils = new DateTimeUtils();
+        _responseMessageBuilder = new ResponseMessageBuilder(_dateTimeUtils);
     }
 
     internal MappingBuilder(
@@ -51,7 +53,8 @@ public class MappingBuilder : IMappingBuilder
         MappingConverter mappingConverter,
         MappingToFileSaver mappingToFileSaver,
         IGuidUtils guidUtils,
-        IDateTimeUtils dateTimeUtils
+        IDateTimeUtils dateTimeUtils,
+        IResponseMessageBuilder responseMessageBuilder
     )
     {
         _settings = Guard.NotNull(settings);
@@ -60,12 +63,13 @@ public class MappingBuilder : IMappingBuilder
         _mappingToFileSaver = Guard.NotNull(mappingToFileSaver);
         _guidUtils = Guard.NotNull(guidUtils);
         _dateTimeUtils = Guard.NotNull(dateTimeUtils);
+        _responseMessageBuilder = Guard.NotNull(responseMessageBuilder);
     }
 
     /// <inheritdoc />
     public IRespondWithAProvider Given(IRequestMatcher requestMatcher, bool saveToFile = false)
     {
-        return new RespondWithAProvider(RegisterMapping, Guard.NotNull(requestMatcher), _settings, _guidUtils, _dateTimeUtils, saveToFile);
+        return new RespondWithAProvider(RegisterMapping, Guard.NotNull(requestMatcher), _settings, _guidUtils, _dateTimeUtils, _responseMessageBuilder, saveToFile);
     }
 
     /// <inheritdoc />

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

@@ -72,6 +72,7 @@ internal partial class AspNetCoreSelfHost
                 services.AddSingleton<IOwinResponseMapper, OwinResponseMapper>();
                 services.AddSingleton<IGuidUtils, GuidUtils>();
                 services.AddSingleton<IDateTimeUtils, DateTimeUtils>();
+                services.AddSingleton<IResponseMessageBuilder, ResponseMessageBuilder>();
                 services.AddSingleton<LogEntryMapper>();
                 services.AddSingleton<IWireMockMiddlewareLogger, WireMockMiddlewareLogger>();
 

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

@@ -11,12 +11,14 @@ internal class GlobalExceptionMiddleware
 {
     private readonly IWireMockMiddlewareOptions _options;
     private readonly IOwinResponseMapper _responseMapper;
+    private readonly IResponseMessageBuilder _responseMessageBuilder;
 
-    public GlobalExceptionMiddleware(RequestDelegate next, IWireMockMiddlewareOptions options, IOwinResponseMapper responseMapper)
+    public GlobalExceptionMiddleware(RequestDelegate next, IWireMockMiddlewareOptions options, IOwinResponseMapper responseMapper, IResponseMessageBuilder responseMessageBuilder)
     {
         Next = next;
         _options = Guard.NotNull(options);
         _responseMapper = Guard.NotNull(responseMapper);
+        _responseMessageBuilder = Guard.NotNull(responseMessageBuilder);
     }
 
     public RequestDelegate Next { get; }
@@ -35,7 +37,7 @@ internal class GlobalExceptionMiddleware
         catch (Exception ex)
         {
             _options.Logger.Error("HttpStatusCode set to 500 {0}", ex);
-            await _responseMapper.MapAsync(ResponseMessageBuilder.Create(500, JsonConvert.SerializeObject(ex)), ctx.Response).ConfigureAwait(false);
+            await _responseMapper.MapAsync(_responseMessageBuilder.Create(500, JsonConvert.SerializeObject(ex)), ctx.Response).ConfigureAwait(false);
         }
     }
 }

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

@@ -26,7 +26,8 @@ internal class WireMockMiddleware(
     IMappingMatcher mappingMatcher,
     IWireMockMiddlewareLogger logger,
     IGuidUtils guidUtils,
-    IDateTimeUtils dateTimeUtils
+    IDateTimeUtils dateTimeUtils,
+    IResponseMessageBuilder responseMessageBuilder
 )
 {
     private readonly object _lock = new();
@@ -97,7 +98,7 @@ internal class WireMockMiddleware(
             {
                 logRequest = true;
                 options.Logger.Warn("HttpStatusCode set to 404 : No matching mapping found");
-                response = ResponseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound);
+                response = responseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound);
                 return;
             }
 
@@ -109,7 +110,7 @@ internal class WireMockMiddleware(
                 if (!authorizationHeaderPresent)
                 {
                     options.Logger.Error("HttpStatusCode set to 401, authorization header is missing.");
-                    response = ResponseMessageBuilder.Create(HttpStatusCode.Unauthorized, null);
+                    response = responseMessageBuilder.Create(HttpStatusCode.Unauthorized, null);
                     return;
                 }
 
@@ -117,7 +118,7 @@ internal class WireMockMiddleware(
                 if (!MatchScores.IsPerfect(authorizationHeaderMatchResult.Score))
                 {
                     options.Logger.Error("HttpStatusCode set to 401, authentication failed.", authorizationHeaderMatchResult.Exception ?? throw new WireMockException("Authentication failed"));
-                    response = ResponseMessageBuilder.Create(HttpStatusCode.Unauthorized, null);
+                    response = responseMessageBuilder.Create(HttpStatusCode.Unauthorized, null);
                     return;
                 }
             }
@@ -165,7 +166,7 @@ internal class WireMockMiddleware(
             options.Logger.Error($"Providing a Response for Mapping '{result.Match?.Mapping.Guid}' failed. HttpStatusCode set to 500. Exception: {ex}");
             WireMockActivitySource.RecordException(activity, ex);
 
-            response = ResponseMessageBuilder.Create(500, ex.Message);
+            response = responseMessageBuilder.Create(500, ex.Message);
         }
         finally
         {
@@ -179,7 +180,7 @@ internal class WireMockMiddleware(
             {
                 options.Logger.Error("HttpStatusCode set to 404 : No matching mapping found", ex);
 
-                var notFoundResponse = ResponseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound);
+                var notFoundResponse = responseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound);
                 await responseMapper.MapAsync(notFoundResponse, ctx.Response).ConfigureAwait(false);
             }
         }

src/WireMock.Net.Minimal/ResponseMessageBuilder.cs

@@ -9,29 +9,30 @@ using WireMock.Util;
 
 namespace WireMock;
 
-internal static class ResponseMessageBuilder
+internal class ResponseMessageBuilder(IDateTimeUtils dateTimeUtils) : IResponseMessageBuilder
 {
     private static readonly IDictionary<string, WireMockList<string>> ContentTypeJsonHeaders = new Dictionary<string, WireMockList<string>>
     {
         { HttpKnownHeaderNames.ContentType, new WireMockList<string> { WireMockConstants.ContentTypeJson } }
     };
 
-    internal static ResponseMessage Create(HttpStatusCode statusCode, string? status, Guid? guid = null)
+    public ResponseMessage Create(HttpStatusCode statusCode, string? status, Guid? guid = null)
     {
-        return Create((int)statusCode, status, guid);
+        return Create((int)statusCode, status, null, guid);
     }
 
-    internal static ResponseMessage Create(int statusCode, string? status, Guid? guid = null)
+    public ResponseMessage Create(int statusCode, string? status, Guid? guid = null)
     {
         return Create(statusCode, status, null, guid);
     }
 
-    internal static ResponseMessage Create(int statusCode, string? status, string? error, Guid? guid = null)
+    public ResponseMessage Create(int statusCode, string? status, string? error, Guid? guid = null)
     {
         var response = new ResponseMessage
         {
             StatusCode = statusCode,
-            Headers = ContentTypeJsonHeaders
+            Headers = ContentTypeJsonHeaders,
+            DateTime = dateTimeUtils.UtcNow
         };
 
         if (status != null || error != null)
@@ -51,7 +52,7 @@ internal static class ResponseMessageBuilder
         return response;
     }
 
-    internal static ResponseMessage Create(HttpStatusCode statusCode)
+    public ResponseMessage Create(HttpStatusCode statusCode)
     {
         return new ResponseMessage
         {

src/WireMock.Net.Minimal/ResponseProviders/WebSocketResponseProvider.cs

@@ -16,7 +16,7 @@ using WireMock.WebSockets;
 
 namespace WireMock.ResponseProviders;
 
-internal class WebSocketResponseProvider(WebSocketBuilder builder, IGuidUtils guidUtils, IDateTimeUtils dateTimeUtils) : IResponseProvider
+internal class WebSocketResponseProvider(WebSocketBuilder builder, IGuidUtils guidUtils, IDateTimeUtils dateTimeUtils, IResponseMessageBuilder responseMessageBuilder) : IResponseProvider
 {
     public async Task<(IResponseMessage Message, IMapping? Mapping)> ProvideResponseAsync(
         IMapping mapping,
@@ -27,7 +27,7 @@ internal class WebSocketResponseProvider(WebSocketBuilder builder, IGuidUtils gu
         // Check if this is a WebSocket upgrade request
         if (!context.WebSockets.IsWebSocketRequest)
         {
-            return (ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, "Bad Request: Not a WebSocket upgrade request"), null);
+            return (responseMessageBuilder.Create(HttpStatusCode.BadRequest, "Bad Request: Not a WebSocket upgrade request"), null);
         }
 
         if (!context.Items.TryGetValue<IWireMockMiddlewareOptions>(nameof(IWireMockMiddlewareOptions), out var options))
@@ -110,7 +110,7 @@ internal class WebSocketResponseProvider(WebSocketBuilder builder, IGuidUtils gu
             // If we haven't upgraded yet, we can return HTTP error
             if (!context.Response.HasStarted)
             {
-                return (ResponseMessageBuilder.Create(HttpStatusCode.InternalServerError, $"WebSocket error: {ex.Message}"), null);
+                return (responseMessageBuilder.Create(HttpStatusCode.InternalServerError, $"WebSocket error: {ex.Message}"), null);
             }
 
             // Already upgraded - return marker

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

@@ -24,6 +24,7 @@ internal class RespondWithAProvider : IRespondWithAProvider
     private readonly WireMockServerSettings _settings;
     private readonly IDateTimeUtils _dateTimeUtils;
     private readonly IGuidUtils _guidUtils;
+    private readonly IResponseMessageBuilder _responseMessageBuilder;
 
     private readonly bool _saveToFile;
 
@@ -56,6 +57,7 @@ internal class RespondWithAProvider : IRespondWithAProvider
         WireMockServerSettings settings,
         IGuidUtils guidUtils,
         IDateTimeUtils dateTimeUtils,
+        IResponseMessageBuilder responseMessageBuilder,
         bool saveToFile = false
     )
     {
@@ -64,6 +66,7 @@ internal class RespondWithAProvider : IRespondWithAProvider
         _settings = Guard.NotNull(settings);
         _dateTimeUtils = Guard.NotNull(dateTimeUtils);
         _guidUtils = Guard.NotNull(guidUtils);
+        _responseMessageBuilder = Guard.NotNull(responseMessageBuilder);
 
         _saveToFile = saveToFile;
 
@@ -79,7 +82,8 @@ internal class RespondWithAProvider : IRespondWithAProvider
             provider = new WebSocketResponseProvider(
                 response.WebSocketBuilder,
                 _guidUtils,
-                _dateTimeUtils
+                _dateTimeUtils,
+                _responseMessageBuilder
             );
         }
 

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

@@ -350,7 +350,7 @@ public partial class WireMockServer
             o.AcceptAnyClientCertificate = _settings.AcceptAnyClientCertificate;
         });
 
-        return ResponseMessageBuilder.Create(200, "Settings updated");
+        return _responseMessageBuilder.Create(200, "Settings updated");
     }
     #endregion Settings
 
@@ -361,7 +361,7 @@ public partial class WireMockServer
         if (mapping == null)
         {
             _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
-            return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+            return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
         }
 
         var model = _mappingConverter.ToMappingModel(mapping);
@@ -377,14 +377,14 @@ public partial class WireMockServer
             if (code is null)
             {
                 _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
-                return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+                return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
             }
 
             return ToResponseMessage(code);
         }
 
         _settings.Logger.Warn("HttpStatusCode set to 400");
-        return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, "GUID is missing");
+        return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, "GUID is missing");
     }
 
     private static TEnum GetEnumFromQuery<TEnum>(IRequestMessage requestMessage, TEnum defaultValue)
@@ -411,22 +411,22 @@ public partial class WireMockServer
             var mappingModel = DeserializeObject<MappingModel>(requestMessage);
             var guidFromPut = ConvertMappingAndRegisterAsRespondProvider(mappingModel, guid);
 
-            return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping added or updated", guidFromPut);
+            return _responseMessageBuilder.Create(HttpStatusCode.OK, "Mapping added or updated", guidFromPut);
         }
 
         _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
-        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
     }
 
     private IResponseMessage MappingDelete(HttpContext _, IRequestMessage requestMessage)
     {
         if (TryParseGuidFromRequestMessage(requestMessage, out var guid) && DeleteMapping(guid))
         {
-            return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping removed", guid);
+            return _responseMessageBuilder.Create(HttpStatusCode.OK, "Mapping removed", guid);
         }
 
         _settings.Logger.Warn("HttpStatusCode set to 404 : Mapping not found");
-        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
     }
 
     private static bool TryParseGuidFromRequestMessage(IRequestMessage requestMessage, out Guid guid)
@@ -452,12 +452,12 @@ public partial class WireMockServer
             if (mapping != null)
             {
                 mapping.IsDisabled = false;
-                return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping enabled", guid);
+                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");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
     }
 
     private IResponseMessage MappingDisable(HttpContext _, IRequestMessage requestMessage)
@@ -468,12 +468,12 @@ public partial class WireMockServer
             if (mapping != null)
             {
                 mapping.IsDisabled = true;
-                return ResponseMessageBuilder.Create(HttpStatusCode.OK, "Mapping disabled", guid);
+                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");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Mapping not found");
     }
     #endregion Mapping/{guid}
 
@@ -496,7 +496,7 @@ public partial class WireMockServer
     {
         SaveStaticMappings();
 
-        return ResponseMessageBuilder.Create(200, "Mappings saved to disk");
+        return _responseMessageBuilder.Create(200, "Mappings saved to disk");
     }
 
     private MappingModel[] ToMappingModels()
@@ -526,22 +526,22 @@ public partial class WireMockServer
             if (mappingModels.Length == 1)
             {
                 var guid = ConvertMappingAndRegisterAsRespondProvider(mappingModels[0]);
-                return ResponseMessageBuilder.Create(201, "Mapping added", guid);
+                return _responseMessageBuilder.Create(201, "Mapping added", guid);
             }
 
             ConvertMappingsAndRegisterAsRespondProvider(mappingModels);
 
-            return ResponseMessageBuilder.Create(201, "Mappings added");
+            return _responseMessageBuilder.Create(201, "Mappings added");
         }
         catch (ArgumentException a)
         {
             _settings.Logger.Error("HttpStatusCode set to 400 {0}", a);
-            return ResponseMessageBuilder.Create(400, a.Message);
+            return _responseMessageBuilder.Create(400, a.Message);
         }
         catch (Exception e)
         {
             _settings.Logger.Error("HttpStatusCode set to 500 {0}", e);
-            return ResponseMessageBuilder.Create(500, e.ToString());
+            return _responseMessageBuilder.Create(500, e.ToString());
         }
     }
 
@@ -552,18 +552,18 @@ public partial class WireMockServer
             var deletedGuids = MappingsDeleteMappingFromBody(requestMessage);
             if (deletedGuids != null)
             {
-                return ResponseMessageBuilder.Create(200, $"Mappings deleted. Affected GUIDs: [{string.Join(", ", deletedGuids.ToArray())}]");
+                return _responseMessageBuilder.Create(200, $"Mappings deleted. Affected GUIDs: [{string.Join(", ", deletedGuids.ToArray())}]");
             }
 
             // return bad request
-            return ResponseMessageBuilder.Create(400, "Poorly formed mapping JSON.");
+            return _responseMessageBuilder.Create(400, "Poorly formed mapping JSON.");
         }
 
         ResetMappings();
 
         ResetScenarios();
 
-        return ResponseMessageBuilder.Create(200, "Mappings deleted");
+        return _responseMessageBuilder.Create(200, "Mappings deleted");
     }
 
     private IEnumerable<Guid>? MappingsDeleteMappingFromBody(IRequestMessage requestMessage)
@@ -615,14 +615,14 @@ public partial class WireMockServer
             message += " and static mappings reloaded";
         }
 
-        return ResponseMessageBuilder.Create(200, message);
+        return _responseMessageBuilder.Create(200, message);
     }
 
     private IResponseMessage ReloadStaticMappings(HttpContext _, IRequestMessage __)
     {
         ReadStaticMappings();
 
-        return ResponseMessageBuilder.Create(200, "Static Mappings reloaded");
+        return _responseMessageBuilder.Create(200, "Static Mappings reloaded");
     }
     #endregion Mappings
 
@@ -640,18 +640,18 @@ public partial class WireMockServer
         }
 
         _settings.Logger.Warn("HttpStatusCode set to 404 : Request not found");
-        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Request not found");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Request not found");
     }
 
     private IResponseMessage RequestDelete(HttpContext _, IRequestMessage requestMessage)
     {
         if (TryParseGuidFromRequestMessage(requestMessage, out var guid) && DeleteLogEntry(guid))
         {
-            return ResponseMessageBuilder.Create(200, "Request removed");
+            return _responseMessageBuilder.Create(200, "Request removed");
         }
 
         _settings.Logger.Warn("HttpStatusCode set to 404 : Request not found");
-        return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "Request not found");
+        return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "Request not found");
     }
     #endregion Request/{guid}
 
@@ -670,7 +670,7 @@ public partial class WireMockServer
     {
         ResetLogEntries();
 
-        return ResponseMessageBuilder.Create(200, "Requests deleted");
+        return _responseMessageBuilder.Create(200, "Requests deleted");
     }
     #endregion Requests
 
@@ -710,7 +710,7 @@ public partial class WireMockServer
             return ToJson(result);
         }
 
-        return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest);
+        return _responseMessageBuilder.Create(HttpStatusCode.BadRequest);
     }
     #endregion Requests/find
 
@@ -733,7 +733,7 @@ public partial class WireMockServer
     {
         ResetScenarios();
 
-        return ResponseMessageBuilder.Create(200, "Scenarios reset");
+        return _responseMessageBuilder.Create(200, "Scenarios reset");
     }
 
     private IResponseMessage ScenarioReset(HttpContext _, IRequestMessage requestMessage)
@@ -743,8 +743,8 @@ public partial class WireMockServer
             Enumerable.Reverse(requestMessage.Path.Split('/')).Skip(1).First();
 
         return ResetScenario(name) ?
-            ResponseMessageBuilder.Create(200, "Scenario reset") :
-            ResponseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
+            _responseMessageBuilder.Create(200, "Scenario reset") :
+            _responseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
     }
 
     private IResponseMessage ScenariosSetState(HttpContext _, IRequestMessage requestMessage)
@@ -752,14 +752,14 @@ public partial class WireMockServer
         var name = Enumerable.Reverse(requestMessage.Path.Split('/')).Skip(1).First();
         if (!_options.ScenarioStateStore.ContainsKey(name))
         {
-            ResponseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
+            _responseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
         }
 
         var update = DeserializeObject<ScenarioStateUpdateModel>(requestMessage);
 
         return SetScenarioState(name, update.State) ?
-            ResponseMessageBuilder.Create(200, $"Scenario state set to '{update.State}'") :
-            ResponseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
+            _responseMessageBuilder.Create(200, $"Scenario state set to '{update.State}'") :
+            _responseMessageBuilder.Create(HttpStatusCode.NotFound, $"No scenario found by name '{name}'.");
     }
     #endregion
 

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

@@ -18,14 +18,14 @@ public partial class WireMockServer
     {
         if (requestMessage.Body is null)
         {
-            return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
+            return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
         }
 
         var id = requestMessage.Path.Split('/').Last();
 
         AddProtoDefinition(id, requestMessage.Body);
 
-        return ResponseMessageBuilder.Create(HttpStatusCode.OK, "ProtoDefinition added");
+        return _responseMessageBuilder.Create(HttpStatusCode.OK, "ProtoDefinition added");
     }
     #endregion
 
@@ -34,7 +34,7 @@ public partial class WireMockServer
     {
         if (requestMessage.BodyAsBytes is null)
         {
-            return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
+            return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
         }
 
         var filename = GetFileNameFromRequestMessage(requestMessage);
@@ -47,14 +47,14 @@ public partial class WireMockServer
 
         _settings.FileSystemHandler.WriteFile(filename, requestMessage.BodyAsBytes);
 
-        return ResponseMessageBuilder.Create(HttpStatusCode.OK, "File created");
+        return _responseMessageBuilder.Create(HttpStatusCode.OK, "File created");
     }
 
     private IResponseMessage FilePut(HttpContext _, IRequestMessage requestMessage)
     {
         if (requestMessage.BodyAsBytes is null)
         {
-            return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
+            return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, "Body is null");
         }
 
         var filename = GetFileNameFromRequestMessage(requestMessage);
@@ -62,12 +62,12 @@ public partial class WireMockServer
         if (!_settings.FileSystemHandler.FileExists(filename))
         {
             _settings.Logger.Info("The file '{0}' does not exist, updating file will be skipped.", filename);
-            return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not found");
+            return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not found");
         }
 
         _settings.FileSystemHandler.WriteFile(filename, requestMessage.BodyAsBytes);
 
-        return ResponseMessageBuilder.Create(HttpStatusCode.OK, "File updated");
+        return _responseMessageBuilder.Create(HttpStatusCode.OK, "File updated");
     }
 
     private IResponseMessage FileGet(HttpContext _, IRequestMessage requestMessage)
@@ -77,7 +77,7 @@ public partial class WireMockServer
         if (!_settings.FileSystemHandler.FileExists(filename))
         {
             _settings.Logger.Info("The file '{0}' does not exist.", filename);
-            return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not found");
+            return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not found");
         }
 
         var bytes = _settings.FileSystemHandler.ReadFile(filename);
@@ -112,10 +112,10 @@ public partial class WireMockServer
         if (!_settings.FileSystemHandler.FileExists(filename))
         {
             _settings.Logger.Info("The file '{0}' does not exist.", filename);
-            return ResponseMessageBuilder.Create(HttpStatusCode.NotFound);
+            return _responseMessageBuilder.Create(HttpStatusCode.NotFound);
         }
 
-        return ResponseMessageBuilder.Create(HttpStatusCode.NoContent);
+        return _responseMessageBuilder.Create(HttpStatusCode.NoContent);
     }
 
     private IResponseMessage FileDelete(HttpContext _, IRequestMessage requestMessage)
@@ -125,11 +125,11 @@ public partial class WireMockServer
         if (!_settings.FileSystemHandler.FileExists(filename))
         {
             _settings.Logger.Info("The file '{0}' does not exist.", filename);
-            return ResponseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not deleted");
+            return _responseMessageBuilder.Create(HttpStatusCode.NotFound, "File is not deleted");
         }
 
         _settings.FileSystemHandler.DeleteFile(filename);
-        return ResponseMessageBuilder.Create(HttpStatusCode.OK, "File deleted.");
+        return _responseMessageBuilder.Create(HttpStatusCode.OK, "File deleted.");
     }
 
     private string GetFileNameFromRequestMessage(IRequestMessage requestMessage)

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

@@ -52,7 +52,7 @@ public partial class WireMockServer
             if (mappingModels.Length == 1)
             {
                 var guid = ConvertWireMockOrgMappingAndRegisterAsRespondProvider(mappingModels[0]);
-                return ResponseMessageBuilder.Create(201, "Mapping added", guid);
+                return _responseMessageBuilder.Create(201, "Mapping added", guid);
             }
 
             foreach (var mappingModel in mappingModels)
@@ -60,17 +60,17 @@ public partial class WireMockServer
                 ConvertWireMockOrgMappingAndRegisterAsRespondProvider(mappingModel);
             }
 
-            return ResponseMessageBuilder.Create(201, "Mappings added");
+            return _responseMessageBuilder.Create(201, "Mappings added");
         }
         catch (ArgumentException a)
         {
             _settings.Logger.Error("HttpStatusCode set to 400 {0}", a);
-            return ResponseMessageBuilder.Create(400, a.Message);
+            return _responseMessageBuilder.Create(400, a.Message);
         }
         catch (Exception e)
         {
             _settings.Logger.Error("HttpStatusCode set to 500 {0}", e);
-            return ResponseMessageBuilder.Create(500, e.ToString());
+            return _responseMessageBuilder.Create(500, e.ToString());
         }
     }
 

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

@@ -19,7 +19,7 @@ public partial class WireMockServer
         catch (Exception e)
         {
             _settings.Logger.Error("HttpStatusCode set to {0} {1}", HttpStatusCode.BadRequest, e);
-            return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, e.Message);
+            return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, e.Message);
         }
     }
 
@@ -35,12 +35,12 @@ public partial class WireMockServer
 
             ConvertMappingsAndRegisterAsRespondProvider(mappingModels);
 
-            return ResponseMessageBuilder.Create(HttpStatusCode.Created, "OpenApi document converted to Mappings");
+            return _responseMessageBuilder.Create(HttpStatusCode.Created, "OpenApi document converted to Mappings");
         }
         catch (Exception e)
         {
             _settings.Logger.Error("HttpStatusCode set to {0} {1}", HttpStatusCode.BadRequest, e);
-            return ResponseMessageBuilder.Create(HttpStatusCode.BadRequest, e.Message);
+            return _responseMessageBuilder.Create(HttpStatusCode.BadRequest, e.Message);
         }
     }
 }

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

@@ -42,6 +42,7 @@ public partial class WireMockServer : IWireMockServer
     private readonly MappingBuilder _mappingBuilder;
     private readonly IGuidUtils _guidUtils = new GuidUtils();
     private readonly IDateTimeUtils _dateTimeUtils = new DateTimeUtils();
+    private readonly IResponseMessageBuilder _responseMessageBuilder;
     private readonly MappingSerializer _mappingSerializer;
 
     /// <inheritdoc />
@@ -354,6 +355,8 @@ public partial class WireMockServer : IWireMockServer
     {
         _settings = Guard.NotNull(settings);
 
+        _responseMessageBuilder = new ResponseMessageBuilder(_dateTimeUtils);
+
         _mappingSerializer = new MappingSerializer(settings.DefaultJsonSerializer ?? new NewtonsoftJsonConverter());
 
         // Set default values if not provided
@@ -407,7 +410,8 @@ public partial class WireMockServer : IWireMockServer
             _mappingConverter,
             _mappingToFileSaver,
             _guidUtils,
-            _dateTimeUtils
+            _dateTimeUtils,
+            _responseMessageBuilder
         );
 
         _options.AdditionalServiceRegistration = _settings.AdditionalServiceRegistration;
@@ -471,7 +475,7 @@ public partial class WireMockServer : IWireMockServer
         Given(Request.Create().WithPath("/*").UsingAnyMethod())
             .WithGuid(Guid.Parse("90008000-0000-4444-a17e-669cd84f1f05"))
             .AtPriority(1000)
-            .RespondWith(new DynamicResponseProvider((_, _) => ResponseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound)));
+            .RespondWith(new DynamicResponseProvider((_, _) => _responseMessageBuilder.Create(HttpStatusCode.NotFound, WireMockConstants.NoMatchingFound)));
     }
 
     /// <inheritdoc cref="IWireMockServer.Reset" />

test/WireMock.Net.Tests/MappingBuilderTests.cs

@@ -59,7 +59,8 @@ public class MappingBuilderTests
             mappingConverter,
             mappingToFileSaver,
             guidUtilsMock.Object,
-            dateTimeUtilsMock.Object
+            dateTimeUtilsMock.Object,
+            new ResponseMessageBuilder(dateTimeUtilsMock.Object)
         );
 
         _sut.Given(Request.Create()

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

@@ -5,6 +5,7 @@ using Moq;
 using WireMock.Logging;
 using WireMock.Owin;
 using WireMock.Owin.Mappers;
+using WireMock.Util;
 
 namespace WireMock.Net.Tests.Owin;
 
@@ -12,6 +13,7 @@ public class GlobalExceptionMiddlewareTests
 {
     private readonly Mock<IWireMockMiddlewareOptions> _optionsMock;
     private readonly Mock<IOwinResponseMapper> _responseMapperMock;
+    private readonly IResponseMessageBuilder _responseMessageBuilder;
 
     private readonly GlobalExceptionMiddleware _sut;
 
@@ -23,7 +25,9 @@ public class GlobalExceptionMiddlewareTests
         _responseMapperMock = new Mock<IOwinResponseMapper>();
         _responseMapperMock.Setup(m => m.MapAsync(It.IsAny<ResponseMessage?>(), It.IsAny<HttpResponse>())).Returns(Task.FromResult(true));
 
-        _sut = new GlobalExceptionMiddleware(_ => Task.CompletedTask, _optionsMock.Object, _responseMapperMock.Object);
+        _responseMessageBuilder = new ResponseMessageBuilder(new DateTimeUtils());
+
+        _sut = new GlobalExceptionMiddleware(_ => Task.CompletedTask, _optionsMock.Object, _responseMapperMock.Object, _responseMessageBuilder);
     }
 
     [Fact]
@@ -37,7 +41,7 @@ public class GlobalExceptionMiddlewareTests
     public void GlobalExceptionMiddleware_Invoke_InvalidNext_ShouldCallResponseMapperWith500()
     {
         // Arrange
-        var sut = new GlobalExceptionMiddleware(_ => throw new ArgumentException(), _optionsMock.Object, _responseMapperMock.Object);
+        var sut = new GlobalExceptionMiddleware(_ => throw new ArgumentException(), _optionsMock.Object, _responseMapperMock.Object, _responseMessageBuilder);
 
         // Act
         sut.Invoke(Mock.Of<HttpContext>());

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

@@ -3,6 +3,7 @@
 using System.Collections.Concurrent;
 using System.Diagnostics;
 using System.Linq.Expressions;
+using System.Net;
 using Microsoft.AspNetCore.Http;
 using Moq;
 using WireMock.Admin.Mappings;
@@ -38,6 +39,7 @@ public class WireMockMiddlewareTests
     private readonly Mock<HttpContext> _contextMock;
     private readonly Mock<IGuidUtils> _guidUtilsMock;
     private readonly Mock<IDateTimeUtils> _dateTimeUtilsMock;
+    private readonly IResponseMessageBuilder _responseMessageBuilderMock;
 
     private readonly WireMockMiddleware _sut;
 
@@ -51,6 +53,8 @@ public class WireMockMiddlewareTests
         _dateTimeUtilsMock = new Mock<IDateTimeUtils>();
         _dateTimeUtilsMock.Setup(d => d.UtcNow).Returns(UtcNow);
 
+        _responseMessageBuilderMock = new ResponseMessageBuilder(_dateTimeUtilsMock.Object);
+
         _optionsMock = new Mock<IWireMockMiddlewareOptions>();
         _optionsMock.SetupAllProperties();
         _optionsMock.Setup(o => o.Mappings).Returns(_mappings);
@@ -90,7 +94,8 @@ public class WireMockMiddlewareTests
             _matcherMock.Object,
             wireMockMiddlewareLoggerMock.Object,
             _guidUtilsMock.Object,
-            _dateTimeUtilsMock.Object
+            _dateTimeUtilsMock.Object,
+            _responseMessageBuilderMock
         );
     }
 
@@ -103,7 +108,10 @@ public class WireMockMiddlewareTests
         // Assert and Verify
         _optionsMock.Verify(o => o.Logger.Warn(It.IsAny<string>(), It.IsAny<object[]>()), Times.Once);
 
-        Expression<Func<ResponseMessage, bool>> match = r => (int)r.StatusCode! == 404 && ((StatusModel)r.BodyData!.BodyAsJson!).Status == "No matching mapping found";
+        Expression<Func<ResponseMessage, bool>> match = r =>
+            (int)r.StatusCode! == 404 &&
+            ((StatusModel)r.BodyData!.BodyAsJson!).Status == "No matching mapping found" &&
+            r.DateTime == UtcNow;
         _responseMapperMock.Verify(m => m.MapAsync(It.Is(match), It.IsAny<HttpResponse>()), Times.Once);
     }