即使在设置 Timeout.Infinite 后 HttpClient 也会超时

Question

我正在使用 HttpClient 使用以下代码从 Xamarin Forms 中的服务器获取数据

public  Task<HttpResponseMessage> sendData(String url,String jsonData)
    {

        using (var client = new HttpClient())
        {

            var jsonContent = new StringContent(jsonData, System.Text.Encoding.UTF8, "application/json");

            client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);
            client.BaseAddress = new Uri(baseAddress);

            return  client.PostAsync(new Uri(url, UriKind.Relative), jsonContent);
        }
    }

这里我使用了 Timeout.Infinite，因为网络服务需要大约 4 分钟才能 return 响应，但尽管我已经设置 Timeout.Infinite 应用程序抛出 Operation time out 异常。我尝试了各种超时以及 240000ms 但仍然出现操作超时。

但是，当我尝试在邮递员中发出相同的请求时，它正在工作，但是 return 在 4 分钟后收到响应。由于它是第三方 api，我们无法在那里更改任何内容。

任何人都可以建议我如何强制 HttpClient 保留更多的响应。

我收到详细异常

{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 
--- End of stack trace from previous location where exception was thrown ---
  at SignodeMSA.WebService.HttpService+<sendData>d__13.MoveNext () [0x0009c] in D:\VsualStudioWorkspace\SignodeMSA\SignodeMSA\SignodeMSA\WebService\HttpService.cs:141 
--- End of stack trace from previous location where exception was thrown ---
  at SignodeMSA.WebService.RestApi+<sendDataSimple>d__96.MoveNext () [0x000b3] in D:\VsualStudioWorkspace\SignodeMSA\SignodeMSA\SignodeMSA\WebService\RestApi.cs:199 }

Answer 1

尝试使用 System.Threading.Timeout 命名空间中的 InfiniteTimeSpan。

client.Timeout = System.Threading.Timeout.InfiniteTimeSpan;

我在我的 Xamarin 项目中使用它，它似乎工作正常。

Answer 2

我已经为 Android 和 iOS 尝试了以下代码，它似乎可以工作，并且在使用 webservice

获取数据时可以在套接字上等待更长时间

在 Xamarin.Android 中使用以下代码并使用 DependencyService

公开它

 public HttpClientHandler GetHttpClientHandler()
        {

            Xamarin.Android.Net.AndroidClientHandler http = new Xamarin.Android.Net.AndroidClientHandler();
            http.ReadTimeout = TimeSpan.FromMinutes(5.0);   


            return http;
        }

在 Xamarin.iOS 中使用以下代码并使用 DependencyService

公开它

HttpMessageHandler IHttpHandler.GetHttpHandler()
{


    NSUrlSessionConfiguration sessionConfig = NSUrlSessionConfiguration.DefaultSessionConfiguration;
    sessionConfig.TimeoutIntervalForRequest = 300;
    sessionConfig.TimeoutIntervalForResource = 300;
    sessionConfig.WaitsForConnectivity = true;


    NSUrlSessionHandler sessionHandler = new NSUrlSessionHandler(sessionConfig);

    return (sessionHandler);
}

注意：在 iOS 的情况下它将 return HttpMessageHandler

在Xamarin.Forms

中的用法

   HttpClient client = new HttpClient(DependencyService.Get<IHttpClientHandler>().GetHttpClient());

但是，这里有一个问题，如果 iOS 如果应用正在使用 HttpClient 获取数据，并且如果用户通过按 iPhone 中的锁定按钮锁定屏幕，则服务立即被打断并抛出 Connection Interrupted 并关闭套接字。如果有人能找到任何解决方案，请随时 post

即使在设置 Timeout.Infinite 后 HttpClient 也会超时

HttpClient getting timed out even after setting Timeout.Infinite

.net

dotnet-httpclient

xamarin

xamarin.forms