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Stesvis-5434 asked LeonLu-MSFT commented

Help with lots of HttpClient errors

Lately I've been seeing tons of HttpClient exceptions in my AppCenter diagnostic reports, examples are:


ModernHttpClient.NativeMessageHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) <0x105255f90 + 0x01143> in <67401bece23c4316a0cb1acd7b396157#792a49c16f2dfe546fe4e57621a98e65>:0
System.Net.WebException: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out."


NativeMessageHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
System.Threading.Tasks.TaskCanceledException: A task was canceled.

Now, while I understand that some users are in remote locations, maybe is there something wrong with ModernHttpClient?
Should I stop using it?

In my app, I defined it like this in App.xaml.cs:

private static HttpClient _myHttpClient;
        public static HttpClient MyHttpClient
                if (_myHttpClient == null)
                    _myHttpClient = new HttpClient(new NativeMessageHandler(false, new TLSConfig()))
                        Timeout = TimeSpan.FromSeconds(45),
                        BaseAddress = new Uri(Misc.Constants.ApiUrlsBase.BaseUrl),

                    _myHttpClient.DefaultRequestHeaders.Add(CustomRequestHeaders.ApiVersion, "2");

                return _myHttpClient;

Can someone suggest a reason why I see so MANY errors like these? Anything obvious that I am missing?

Could this setting be an issue?

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Above exception is related to Network conntection between Client to Server.

Please advice you users to open your application's settings, If your application have selected WLAN & Cellular Data like following screenshot.


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@LeonLu-MSFT yes they all have WiFi and Data always enabled. In fact most of the time everything works, but then a few times a day they throw these exceptions, and if you multiply by the number of users, I get lots.

I wonder if ModernHttpClient could be an extra problem. Should I remove it and use the native HttpClient?

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It is caused by the network connection, Users' connection not stable.

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