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xamarin.android - HttpClient.PostAsync 抛出 Javax.Net.Ssl.SSLException

问题描述

httpclient PostAysnc 方法有时会抛出 Javax.Net.Ssl.SSLException。我确信端点 url 和 httpContent 是有效的。这种异常只发生在非常低​​的频率。

异常消息是“读取错误：ssl=0x716ae3b788：发生 SSL_ERROR_WANT_READ。您永远不会看到这个。”

项目环境：Xamarin.Android with NETStandard.Library 2.0.3 Android 构建配置：HttpClient 实现：“AndroidClientHandler” SSL/TLS 实现：“Native TLS 1.2+”

下面是详细的堆栈跟踪：

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();
    }
}

标签： xamarin.androidhttpclientsslexception

解决方案

我想我已经弄清楚了这个异常的原因和解决方案。原因是Android AndroidClientHandler 在处理HTTP 请求的过程中会抛出Java 异常。（然而，iOS Handler 会抛出 .NET HttpRequestException 或 WebException）。这些异常通常在网络不稳定时发生，如果我们再试一次应该没问题。对于我的情况，因为我应用了 Polly 策略，我只是捕获所有异常并通过字符串比较来获取异常类型名称。关于 android 处理程序的参考：github.com/xamarin/xamarin-android/issues/3216

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