拦截C#HttpClient GetAsync

Question

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

我想检查我的所有Get/PostAsync调用对statusCode 401的响应,但我发现我只能SendAsync在实现时覆盖该方法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)
        {

我还能做些什么,以免改变我所有的异步调用的实现SendAsync吗？

(我真正想要做的是刷新accessToken.)

Answer 1

我认为你走在正确的轨道上.你不会需要更改您的通话使用SendAsync的替代GetAsync,PostAsync不过,等.相反,您需要更改实例化的方式HttpClient:

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