Question

我正在使用HttpClient与具有很多API的Web服务（由我的公司编写）进行交互。所有api都运作良好，除非其中一个（较大和较慢）需要100秒钟以上的时间来给出答案，然后经过这段时间，我收到以下错误消息（注意：如果api所用时间少于100s，则一切正常）： / p>

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Web服务超时都设置为5分钟，所以我认为我可以排除这是Web服务超时问题，并且在应用程序上，我将HttpClient超时设置为10分钟（但是即使我设置了，它也无法正常工作） 5分钟），就像您在下面的代码中看到的一样。我在做什么错了？

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。

EDIT 2019-01-23 14:21：

100s超时是默认的HttpClient超时，因此

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

不覆盖默认值。

我无法理解什么是InfiniteTimeSpan，因此我尝试遵循that post中的两个答案。没有成功:(它仍然会在100秒后显示超时错误。

Answer 1

如果您在环境中使用负载平衡器，请务必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会议。没有代码解决方案:(

System.Net.Http.HttpClient不尊重超时，每次使用默认值

1 个答案: