ReadAsync/SendAsync app crash

[stesvis]

Hello,

I have many crash reports in AppCenter that are related to the GetAsync() and SendAsync() methods.

ModernHttpClient
ByteArrayListStream.ReadAsync (System.Byte[] buffer, System.Int32 offset, System.Int32 count, System.Threading.CancellationToken cancellationToken)
ModernHttpClient
ProgressStreamContent+ProgressStream.ReadAsync (System.Byte[] buffer, System.Int32 offset, System.Int32 count, System.Threading.CancellationToken cancellationToken)
System.IO
Stream.CopyToAsyncInternal (System.IO.Stream destination, System.Int32 bufferSize, System.Threading.CancellationToken cancellationToken)
System.Net.Http
StreamToStreamCopy+<>c.b__1_0 (System.Threading.Tasks.Task completed, System.Object innerSource)
System.Threading.Tasks
ContinuationTaskFromTask.InnerInvoke ()
System.Threading.Tasks
Task.Execute ()
System.Net.Http
HttpContent.LoadIntoBufferAsyncCore (System.Threading.Tasks.Task serializeToStreamTask, System.IO.MemoryStream tempBuffer)
System.Net.Http
HttpClient.FinishSendAsyncBuffered (System.Threading.Tasks.Task`1[TResult] sendTask, System.Net.Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts)

I have the relevant code lines inside a try/catch, but still it causes a crash (sometimes, when the connection times out i think):

try 
{
    // ...
    var response = await WebApiClient.GetAsync(url);
    var responseJson = await response.Content.ReadAsStringAsync();
    // ...
}
catch (Exception ex) 
{
    // ... handle it
}

Where WebApiClient is a global HttpClient instance:

public static HttpClient WebApiClient = new HttpClient(new NativeMessageHandler(false, new TLSConfig()))
        {
            Timeout = TimeSpan.FromSeconds(45),
            BaseAddress = new Uri(Misc.Constants.ApiUrlsBase.BaseUrl),
        });

Why would it make the app crash even tho i am using try/catch? Like I said, the error is related to timeouts:

I hope that someone may help me figure this out, thank you.

[alexrainman]

The max timeout you can set is 30 seconds (by platform specific limitations). Can you provide a reproduction demo?

[stesvis]

After further testing i was able to simulate poor internet connection and reproduce this exception.
I think it's just related to weak internet.

[petro2050]

I think the implementation of #72 can help with this.