在HttpWebRequest.GetResponse（）VS GetResponseAsync（超时行为） [英] Timeout behaviour in HttpWebRequest.GetResponse() vs GetResponseAsync()

问题描述

当我尝试以下code：

When I try the following code:

var request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Timeout = 3; // a small value

var response = request.GetResponse();
Console.WriteLine(response.ContentLength);

有关的URL，我知道这是要采取超过3毫秒加载（我放了 Thread.sleep代码（110000）在的Application_BeginRequest ），它工作正常，并抛出一个引发WebException 预期。

for a URL that I know it is going to take more than 3 millisecond to load (I put a Thread.Sleep(110000) in Application_BeginRequest) it works fine and throws a WebException as expected.

问题是，当我切换到异步方法：

Problem is when I switch to async method:

var response = request.GetResponseAsync().Result;

或

var response = await request.GetResponseAsync();

这异步版本完全忽略任何超时值，包括 ReadWriteTimeout 和 ServicePoint.MaxIdleTime

This async version completely ignores any Timeout value, including ReadWriteTimeout and ServicePoint.MaxIdleTime

我找不到关于超时MSDN的 GetResponseAsync（）现在我想知道如果是在错误GetResponseAsync（）<什么/ code>什么是错在我这里异步使用的方式？

I couldn't find anything about Timeout in MSDN's GetResponseAsync() now I'm wondering if it is a bug in GetResponseAsync() or something is wrong in the way I use async here?

推荐答案

超时不适用于异步的HttpWebRequest 要求。引用的文档：

Timeout does not apply to asynchronous HttpWebRequest requests. To quote the docs:

超时属性对异步请求没有影响。

The Timeout property has no effect on asynchronous requests

我推荐你使用的HttpClient 来代替，这是设计时考虑异步请求。

I recommend you use HttpClient instead, which was designed with asynchronous requests in mind.

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