拦截C#HttpClient GetAsync [英] Intercept C# HttpClient GetAsync

问题描述

我有一个Web项目(C#，MVC5，但没有WebAPI)和一个简单的HTTP REST客户端，该客户端正在调用外部REST服务并获取accessToken等.

I have a web project (C#, MVC5 but no WebAPI) and a simple HTTP REST client that is calling an external REST service and acquires an accessToken etcing.

我想检查我所有对statusCode 401的Get/PostAsync调用的响应，但是我发现在实现DelegatingHandler时只能覆盖SendAsync方法.

I want to check the response from all my Get/PostAsync calls for statusCode 401 but I see that I can only override the SendAsync method when implementing the DelegatingHandler.

class CustomDelegatingHandler : DelegatingHandler
{
    async protected override Task<HttpResponseMessage> SendAsync(
        HttpRequestMessage request, CancellationToken cancellationToken)
    {
        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

        if (response.StatusCode == HttpStatusCode.Unauthorized)
        {

还有其他方法可以使我不更改所有异步调用的实现以使用SendAsync吗?

Is there something else I can do so as not to change the implementation of all my async calls to use SendAsync?

(我真正想做的是刷新accessToken.)

(What I really really want to do is refresh the accessToken.)

推荐答案

我认为您的做法正确.不过，您无需将调用更改为使用SendAsync而不是GetAsync，PostAsync等.相反，您需要更改实例化HttpClient的方式:

I think you're on the right track. You wouldn't need to change your calls to use SendAsync instead of GetAsync, PostAsync, etc though. Rather, you'd need to change how you instantiate HttpClient:

var client = new HttpClient(new CustomDelegatingHandlerTokenRefresher());
// GetAsync, PostAsync, etc will hit your handler

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