.

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

@@ -28,6 +28,8 @@ using Next = Microsoft.Owin.OwinMiddleware;
 using OwinMiddleware = System.Object;
 using IContext = Microsoft.AspNetCore.Http.HttpContext;
 using Next = Microsoft.AspNetCore.Http.RequestDelegate;
+using HandlebarsDotNet;
+using WireMock.Org.Abstractions;
 #endif
 
 namespace WireMock.Owin
@@ -169,6 +171,20 @@ namespace WireMock.Owin
                     return;
                 }
 
+#if USE_ASPNETCORE && NET8_0_OR_GREATER
+                if (ctx.WebSockets.IsWebSocketRequest)
+                {
+                    // Accept WebSocket upgrade
+                    var webSocket = await ctx.WebSockets.AcceptWebSocketAsync();
+
+                    // Get and invoke handler
+                    var provider = targetMapping.Provider as WireMock.WebSockets.ResponseProviders.WebSocketResponseProvider;
+                    await provider.HandleWebSocketAsync(webSocket, request);
+
+                    return;  // Don't process as HTTP
+                }
+#endif
+
                 logRequest = targetMapping.LogMapping;
 
                 if (targetMapping.IsAdminInterface && _options.AuthenticationMatcher != null && request.Headers != null)

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

@@ -16,7 +16,7 @@ namespace WireMock.WebSockets.ResponseProviders;
 /// <summary>
 /// Response provider for handling WebSocket connections.
 /// </summary>
-internal class WebSocketResponseProvider : IResponseProvider
+public class WebSocketResponseProvider : IResponseProvider
 {
     private readonly Func<WebSocketHandlerContext, Task>? _handler;
     private readonly Func<WebSocketMessage, Task<WebSocketMessage?>>? _messageHandler;

test/WireMock.Net.Tests/WebSockets/WebSocketTests.cs

@@ -59,7 +59,7 @@ public class WebSocketTests
         // Act
         using var client = new ClientWebSocket();
         await client.ConnectAsync(
-            new Uri($"ws://localhost:{server.Port}/echo"),
+            new Uri($"ws://{server.Url}/echo"),
             CancellationToken.None);
 
         var message = Encoding.UTF8.GetBytes("Hello WebSocket!");