DelegatingHandler在响应的WebAPI [英] DelegatingHandler for response in WebApi

问题描述

我目前使用的几个代表团处理器（从派生类 DelegatingHandler ），以对工作的要求发送之前，对于像验证签名等，这是所有很不错，因为我没有重复签名验证的所有电话（例如）。

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).

我想用从同一Web请求的响应同样的原则。是否有类似DelegatingHandler的响应的东西？办法赶上响应之前就已经回到了方法，在某种程度上？

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?

更多信息：
我使用调用Web API HttpClient.PutAsync（...）

推荐答案

是的。你可以做，在延续任务。

Yes. You can do that in the continuation task.

我解释一下这里。

例如，这code（从博客上面）的痕迹请求的URI，并增加了一个虚拟头的响应。

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

public class DummyHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        // work on the request 
       Trace.WriteLine(request.RequestUri.ToString());

       return base.SendAsync(request, cancellationToken)
           .ContinueWith(task =>
           {
               // work on the response
               var response = task.Result;
               response.Headers.Add("X-Dummy-Header", Guid.NewGuid().ToString());
              return response;
           });
    }
}

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