Question

httpclient PostAysnc方法有时会引发Javax.Net.Ssl.SSLException。我确定端点url和httpContent有效。这种异常仅在非常低的频率下发生。

异常消息为“读取错误：ssl = 0x716ae3b788：发生SSL_ERROR_WANT_READ。您永远都不会看到此消息。”

项目环境：带有NETStandard.Library 2.0.3的Xamarin.Android Android构建配置： HttpClient实现：“ AndroidClientHandler” SSL / TLS实施：“本地TLS 1.2 +”

下面是详细信息堆栈跟踪：

Java.Interop
JniEnvironment+InstanceMethods.CallIntMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args)
Java.Interop
JniPeerMembers+JniInstanceMethods.InvokeVirtualInt32Method (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters)
Java.Net
HttpURLConnection.get_ResponseCode ()
Xamarin.Android.Net
AndroidClientHandler+<>c__DisplayClass46_0.<DoProcessRequest>b__1 ()
System.Threading.Tasks
Task`1[TResult].InnerInvoke ()
System.Threading.Tasks
Task.Execute ()
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)
Xamarin.Android.Net
AndroidClientHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
System.Net.Http
HttpClient.SendAsyncWorker (System.Net.Http.HttpRequestMessage request, System.Net.Http.HttpCompletionOption completionOption, System.Threading.CancellationToken cancellationToken)
UbiParkLib.Services.ApiCommon
APIBaseService.Post (System.String endPoint, System.Object payload) /Users/kevinhu/Source/UbiParkApp/UbiParkApp/UbiParkLib/Services/ApiCommon/APIBaseService.cs:371

源代码： “ await _httpClient.PostAsync（endPoint，httpContent）”是引发异常的行。

using (HttpContent httpContent = new StringContent(json, Encoding.UTF8, "application/json"))
{
    using (var response = await _httpClient.PostAsync(endPoint, httpContent))
    {
        response.EnsureSuccessStatusCode();
        result = await response.Content.ReadAsStringAsync();
    }
}

Answer 1

我想我已经找到了导致此异常的原因和解决方案。原因是Android AndroidClientHandler在处理HTTP请求期间会抛出Java异常。（但是，iOS处理程序将抛出.NET HttpRequestException或WebException）。这些异常通常在网络不稳定时发生，如果我们再试一次就可以了。对于我的情况，因为我应用了Polly策略，所以我只是捕获了所有异常，并通过字符串比较来确定异常类型的名称。有关android处理程序的参考：github.com/xamarin/xamarin-android/issues/3216

HttpClient.PostAsync抛出Javax.Net.Ssl.SSLException

1 个答案: