Question

我正在开发一个Xamarin Forms应用程序，它基本上通过HttpClient使用GetAsync（Uri requestUri）函数：

    HttpClient httpClient = new HttpClient(new NativeMessageHandler());
    var uri = new Uri(http://www.appwebservice.meusite.com.br);
    httpResponseMessage = await httpClient.GetAsync(uri);

此网址会自动重定向到另一个网址（如http://xxx.xx.xxx.xx:81/AppWebServiceBase/AppService.svc/json/WebServiceUrl所示），但是这个重定向不是由应用程序完成的，而是由托管服务本身完成的，假设我将链接http://www.appwebservice.meusite.com.br放入浏览器，它会自动重定向到网址http://xxx.xx.xxx.xx:81/AppWebServiceBase/AppService.svc/json/WebServiceUrl。

在UWP平台上，这可以正常工作，但是在Android和iOS平台上它会出错。

Android错误

   --- End of managed Java.Net.MalformedURLException stack trace ---
   java.net.MalformedURLException: java.lang.NumberFormatException: Invalid int: "81\AppWebServiceBase\AppService.svc\json\WebServiceUrl"
   at java.net.URL.<init>(URL.java:192)
   at java.net.URL.<init>(URL.java:139)
   at com.squareup.okhttp.internal.http.HttpEngine.followUpRequest(HttpEngine.java:1009)
   at com.squareup.okhttp.Call.getResponse(Call.java:285)
   at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:228)
   at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:199)
   at com.squareup.okhttp.Call.access$100(Call.java:34)
   at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:162)
   at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
   at java.lang.Thread.run(Thread.java:856)

iOS错误：

   Invalid URI: Invalid port specified.
   at System.Uri.CreateThis (System.String uri, System.Boolean dontEscape, System.UriKind uriKind) [0x0007b] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/System/net/System/UriExt.cs:55 
   at System.Uri..ctor (System.String uriString) [0x00014] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/System/net/System/URI.cs:408 
   at ModernHttpClient.NativeMessageHandler+DataTaskDelegate.DidReceiveResponse (Foundation.NSUrlSession session, Foundation.NSUrlSessionDataTask dataTask, Foundation.NSUrlResponse response, System.Action`1[T] completionHandler) [0x00106] in /Users/paul/code/paulcbetts/modernhttpclient/src/ModernHttpClient/iOS/NSUrlSessionHandler.cs:184 
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:152 
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 
   at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/11.6.1.4/src/mono/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 
   at OuvidoriaApp.Services.SaudeWebService+<ServiceCall>d__0.MoveNext () [0x000f1] in C:\Workspace\OuvidoriaApp\OuvidoriaApp\OuvidoriaApp\Services\OuvidoriaWebService.cs:44

如果我把网址重定向，即把IP地址放到应用程序正常工作，问题似乎是在www地址......

当我禁用自动重定向时，httpResponseMessage会收到以下值：

    ReasonPhrase: Moved Temporarily
    StatusCode: 302 (System.Net.HttpStatusCode.Found)
    IsSuccessStatusCode: false
    Content: 
    <html>
        <head><title>Object moved</title></head>
        <body>
            <h2>Object moved to <a href="http://xxx.xx.xxx.xx:81\AppWebServiceBase\AppService.svc\json\WebServiceUrl">here</a>.</h2>
        </body> 
        and here messages to the user saying that an error has occurred
    </html>

内容（http://xxx.xx.xxx.xx:81 \ AppWebServiceBase \ AppService.svc \ json \ WebServiceUrl）上的这个href是我需要的正确重定向。

注意：我更改了网址并进行了错误处理，我总结了错误所在的方式，我希望这一点很明显。

Android和ios平台上的错误，在重定向网址

0 个答案: