c# - System.Net.Http.HttpClient 不尊重超时并每次使用默认值

Question

我正在使用 HttpClient 与具有大量 api 的网络服务(由我的公司编写)进行交互。
所有的 api 都很好用，除非其中一个(较大和较慢的)需要超过 100 秒才能给出答案，过了那个时间我收到以下错误(注意:如果 api 花费的时间少于 100 秒，一切正常):

System.Net.Http.HttpRequestException: An error occurred while sending the request ---> System.Net.WebException: The operation has timed out.
  at System.Net.HttpWebRequest+<RunWithTimeoutWorker>d__241`1[T].MoveNext () [0x000c5] in <3e9b3e26c4694baab3f689687ad40612>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Net.HttpWebRequest.EndGetResponse (System.IAsyncResult asyncResult) [0x00020] in <3e9b3e26c4694baab3f689687ad40612>:0 
  at System.Threading.Tasks.TaskFactory`1[TResult].FromAsyncCoreLogic (System.IAsyncResult iar, System.Func`2[T,TResult] endFunction, System.Action`1[T] endAction, System.Threading.Tasks.Task`1[TResult] promise, System.Boolean requiresSynchronization) [0x0000f] in <d4a23bbd2f544c30a48c44dd622ce09f>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Net.Http.HttpClientHandler+<SendAsync>d__64.MoveNext () [0x0041d] in <25ebe1083eaf4329b5adfdd5bbb7aa57>:0 
   --- End of inner exception stack trace ---
  at System.Net.Http.HttpClientHandler+<SendAsync>d__64.MoveNext () [0x00478] in <25ebe1083eaf4329b5adfdd5bbb7aa57>:0 
--- End of stack trace from previous location where exception was thrown ---
  at System.Net.Http.HttpClient+<SendAsyncWorker>d__49.MoveNext () [0x000ca] in <25ebe1083eaf4329b5adfdd5bbb7aa57>:0 

所有 IIS 和 webservice 超时都设置为 5 分钟，所以我想我可以排除这是一个 Web 服务超时问题，在应用程序上我将 HttpClient 超时设置为 10 分钟(但即使我将其设置为 5 也不起作用)分钟)，就像您在下面的代码中看到的那样。我在做什么错？

代码:

var handler = new HttpClientHandler() { CookieContainer = cookie,
                                        MaxRequestContentBufferSize = 256000000,
                                        UseCookies = true,
};
HttpClient newclient = new HttpClient(handler);

newclient.Timeout = new TimeSpan(0, 10, 0); //That DIDN'T WORK :(

// ALL THE CODE I NEED TO BUILD MY JSON INSIDE jSoNToPost
//....
//....

//convert it to JSON acceptible content
HttpContent formContent = new StringContent(jSoNToPost, Encoding.UTF8, "application/json");

var uri = new Uri(Path.Combine(BaseUrl, "BIG_API_NAME"));

var response1 = await newclient.PostAsync(uri, formContent); // <-- THE EXCEPTION IS THROWN HERE!!!!!

if (response1.IsSuccessStatusCode)
{
    //Other Stuff
    //....
    //....
}
else
{
    //Other Stuff
    //....
    //....
}

环境:

Window 10、Visual Studio 2017、Xamarin IOS 和 Android。

编辑 2019-01-23 14:21:

100s 超时是默认的 HttpClient 超时，所以

newclient.Timeout = new TimeSpan(0, 10, 0);

不覆盖默认值。

我不明白什么是 InfiniteTimeSpan，我尝试遵循 that post 中的两个答案.没有成功 :( 它在 100 秒后仍然显示超时错误。

Answer 1

如果您在您的环境中使用负载平衡器，请确保检查是否在该级别设置了时间限制。作为安全措施，有些人会在某个时间点后切断 session 。没有代码解决方案:(