unexpected end of stream on com.android.okhttp.Address@403f40ec

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Why do I keep getting below error when trying to use simple PostAsync()? For example, below code is used to update the user sector(s) so if the user click on first sector and wait for some seconds before clicking on the second sector then no issue but if he selects multiple one after the other without waiting it will throw this error.

Kindly help..

Here is the code:

async void update_sector(string sector)
    var client = new HttpClient();
    client.BaseAddress = new Uri("https://www.mydomain.com/update_user_sector.php");
    var content = new FormUrlEncodedContent(new[]
        new KeyValuePair<string, string>("user", Preferences.Get("UserID", null)),
        new KeyValuePair<string, string>("sector", sector)
    var response = await client.PostAsync("https://www.mydomain.com/update_user_sector.php", content);
and this is the error:  
Java.IO.IOException: unexpected end of stream on com.android.okhttp.Address@403f40ec ---> Java.IO.EOFException: \n not found: size=0 content=...  

  at java.io.EOFException: \n not found: size=0 content=...  

  at at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:212)  

  at at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:395)  

  at at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:146)  

  at at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:900)  

  at at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:772)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:493)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:429)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:560)  

  at at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getResponseCode(DelegatingHttpsURLConnection.java:106)  

  at at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:30)  

  --- End of inner exception stack trace ---  

  at Java.Interop.JniEnvironment+InstanceMethods.CallIntMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x0006e] in <8b3b636835d84984ba4604c1f57b1983>:0  

  at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeVirtualInt32Method (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x0002a] in <8b3b636835d84984ba4604c1f57b1983>:0  

  at Java.Net.HttpURLConnection.get_ResponseCode () [0x0000a] in <84ca7e914f6148f0b961431a9ac4287b>:0  

  at Xamarin.Android.Net.AndroidClientHandler+<>c__DisplayClass46_0.<DoProcessRequest>b__2 () [0x00000] in <84ca7e914f6148f0b961431a9ac4287b>:0  

  at System.Threading.Tasks.Task1[TResult].InnerInvoke () [0x0000f] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Future.cs:534     at System.Threading.Tasks.Task.Execute () [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corert/src/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs:2319     at Xamarin.Android.Net.AndroidClientHandler.DoProcessRequest (System.Net.Http.HttpRequestMessage request, Java.Net.URL javaUrl, Java.Net.HttpURLConnection httpConnection, System.Threading.CancellationToken cancellationToken, Xamarin.Android.Net.AndroidClientHandler+RequestRedirectionState redirectState) [0x00372] in <84ca7e914f6148f0b961431a9ac4287b>:0     at Xamarin.Android.Net.AndroidClientHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) [0x002d0] in <84ca7e914f6148f0b961431a9ac4287b>:0     at System.Net.Http.HttpClient.FinishSendAsyncBuffered (System.Threading.Tasks.Task1[TResult] sendTask, System.Net.Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts) [0x0017e] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/external/corefx/src/System.Net.Http/src/System/Net/Http/HttpClient.cs:506  

  at Angels.FirstTimeSignin.update_sector (System.String sector) [0x00110] in /Users/jassim/Projects/Angels/Angels/Angels/FirstTimeSignin.xaml.cs:211  

  at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021  

  at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in <84ca7e914f6148f0b961431a9ac4287b>:0  

  at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in <84ca7e914f6148f0b961431a9ac4287b>:0  

  at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in <84ca7e914f6148f0b961431a9ac4287b>:0  

  at at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.1(intptr,intptr)  

  at java.io.IOException: unexpected end of stream on com.android.okhttp.Address@403f40ec  

  at at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:410)  

  at at com.android.okhttp.internal.http.Http1xStream.readResponseHeaders(Http1xStream.java:146)  

  at at com.android.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:900)  

  at at com.android.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:772)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:493)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:429)  

  at at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:560)  

  at at com.android.okhttp.internal.huc.DelegatingHttpsURLConnection.getResponseCode(DelegatingHttpsURLConnection.java:106)  

  at at com.android.okhttp.internal.huc.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:30)  

  at Caused by: java.io.EOFException: \n not found: size=0 content=...  

  at at com.android.okhttp.okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:212)  

  at at com.android.okhttp.internal.http.Http1xStream.readResponse(Http1xStream.java:395)  

  at ... 8 more  
Thanks,  

Jassim  
but if he selects multiple one after the other without waiting it will throw this error
Hi, JassimRahma-2616. You could disable the other buttons when clicking one button. To fix the issue, try to set android:usesCleartextTraffic to in the <application> tag.
Here is a similar issue case, you could refer to it.  

https://stackoverflow.com/questions/54308376/how-to-fix-a-java-io-ioexception-unexpected-end-of-stream-on-connection-excep