DelegatingHandler for response in WebApi

Question

I am currently using several delegation handlers (classes derived from DelegatingHandler) to work on the request before it is sent, for things like validating a signature etc. This is all very nice, because I don't have to duplicate signature validation on all calls (for example).

I would like to use the same principle on the response from the same web request. Is there something similar to the DelegatingHandler for the response? A way to catch the response before it has returned to the method, in a way?

Additional information: I am calling a web api using HttpClient.PutAsync(...)

Answer 1

Yes. You can do that in the continuation task.

I explain it here.

For example, this code (from the blog above) traces request URI and adds a dummy header to response.

public class DummyHandler : DelegatingHandler {     protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)     {         // work on the request         Trace.WriteLine(request.RequestUri.ToString());         var response = await base.SendAsync(request, cancellationToken);        response.Headers.Add("X-Dummy-Header", Guid.NewGuid().ToString());        return response;     } }