@@ -281,43 +281,51 @@ var result = await httpClient.PostAsync<UploadResponse, string>(
281281);
282282```
283283
284- ## Testing with Mock HttpClient
284+ ## Mocking with Delegating Handlers for Tests
285285
286- Mock ` HttpClient ` by creating a fake ` IHttpClientFactory ` with pattern - matched responses :
286+ Mock HTTP calls by inheriting from ` DelegatingHandler ` and overriding ` SendAsync ` ([ see Microsoft docs ]( https : // learn.microsoft.com/en-us/aspnet/web-api/overview/advanced/httpclient-message-handlers)) :
287287
288288```csharp
289- var factory = FakeHttpClientFactory .CreateMockHttpClientFactory (
290- response : null , // Use pattern matching for dynamic responses
291- onRequestSent : request =>
289+ class MockHandler : DelegatingHandler
290+ {
291+ protected override Task < HttpResponseMessage > SendAsync (
292+ HttpRequestMessage request , CancellationToken cancellationToken )
292293 {
293- // Assert request properties
294- Assert .Equal (" Bearer token" request .Headers .Authorization ? .Parameter );
294+ var response = (request .Method .Method , request .RequestUri ? .PathAndQuery ) switch
295+ {
296+ (" GET" " /posts/1" => new HttpResponseMessage (HttpStatusCode .OK )
297+ {
298+ Content = JsonContent .Create (new Post (1 , 1 , " Title" " Body"
299+ },
300+ (" POST" " /posts" => new HttpResponseMessage (HttpStatusCode .Created )
301+ {
302+ Content = JsonContent .Create (new { Id = 101 })
303+ },
304+ _ => new HttpResponseMessage (HttpStatusCode .NotFound )
305+ };
306+
307+ return Task .FromResult (response );
295308 }
296- );
297-
298- // The handler returns responses based on method + URI patterns:
299- // GET /posts -> 200 OK with post JSON
300- // POST /posts -> 201 Created
301- // PUT /posts/1 -> 200 OK
302- // DELETE /posts/1 -> 200 OK
303- // * -> 404 Not Found
309+ }
304310
305- var httpClient = factory . CreateClient ();
306- var result = await httpClient . GetAsync < Post , ErrorResponse >( /* ... */
311+ // Create HttpClient with mock handler
312+ var httpClient = new HttpClient ( new MockHandler () );
307313
308- // Test with exceptions
309- var exFactory = FakeHttpClientFactory .CreateMockHttpClientFactory (
310- exceptionToThrow : new HttpRequestException (" Network error"
314+ // Make calls - they hit the mock handler
315+ var result = await httpClient .GetAsync (
316+ url : " https://api.example.com/posts/1" ToAbsoluteUrl (),
317+ deserializeSuccess : DeserializePost ,
318+ deserializeError : DeserializeError
311319);
312320
313- // Test with simulated delays
314- var delayFactory = FakeHttpClientFactory .CreateMockHttpClientFactory (
315- simulatedDelay : TimeSpan .FromMilliseconds (500 )
316- );
321+ // Result contains mocked data
322+ result switch
323+ {
324+ OkPost (var post ) => Console .WriteLine ($" Got mocked post: {post .Title }"
325+ ErrorPost (var error ) => Console .WriteLine ($" Error: {error .StatusCode }"
326+ };
317327```
318328
319- The fake handler uses a switch expression on `(HttpMethod , Uri )` tuples—extend it for your test scenarios.
320-
321329## Upgrading from RestClient.Net 6.x
322330
323331You can continue to use the V6 `IClient ` interface with RestClient .Net 7 . RestClient .Net 7 is a complete rewrite with a functional architecture . For existing v6 users , ** RestClient .Net .Original ** provides a polyfill that implements the v6 `IClient ` interface using v7 under the hood .
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