Wie kann ich Headers mit Silverlight GET HttpWebRequest?

Question

Einen Antrag auf einen RESTful Service in Silverlight mit HttpWebRequest funktioniert gut, solange ich hinzufügen, keine Header auf die Anfrage.

Sobald ich einen Header mit Code wie folgt hinzufügen

var webReq = (HttpWebRequest)WebRequest.Create(new Uri(_RemoteAddress, "GetProviderMetadata"));
webReq.Method = HttpMethodType.Get;
webReq.Headers["SomeToken"] = "someTokenValue";

Ich bekomme die Ausnahme am unteren Rand dieser Frage eingefügt, sobald EndGetResponse() genannt wird. Wer weiß, warum das so ist? Hinzufügen von Header-Anfragen zu erhalten scheint in normaler .NET gut zu funktionieren, so vermute ich, es irgendeine Art von Silverlight Einschränkung ist, aber ich kann keine Dokumentation finden, die klarstellt.

   {System.NotSupportedException ---> System.NotSupportedException: Specified method is not supported.
  at System.Net.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
  at System.Net.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)
  --- End of inner exception stack trace ---
  at System.Net.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
  at System.Net.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClassd.<InvokeGetResponseCallback>b__b(Object state2)
  at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)}
   [System.NotSupportedException]: {System.NotSupportedException ---> System.NotSupportedException: Specified method is not supported.
  at System.Net.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
  at System.Net.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)
  --- End of inner exception stack trace ---
  at System.Net.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
  at System.Net.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClassd.<InvokeGetResponseCallback>b__b(Object state2)
  at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)
  at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)}
   _className: "System.NotSupportedException"
   _data: {System.Collections.ListDictionaryInternal}
   _dynamicMethods: null
   _exceptionMethod: null
   _exceptionMethodString: null
   _helpURL: null
   _HResult: -2146233067
   _innerException: {System.NotSupportedException: Specified method is not supported.
  at System.Net.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
  at System.Net.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)}
   _message: ""
   _remoteStackIndex: 0
   _remoteStackTraceString: null
   _source: "System.Windows"
   _stackTrace: {sbyte[192]}
   _stackTraceString: null
   _xcode: -532462766
   _xptrs: 0
   Data: {System.Collections.ListDictionaryInternal}
   HelpLink: null
   HResult: -2146233067
   InnerException: {System.NotSupportedException: Specified method is not supported.
  at System.Net.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
  at System.Net.BrowserHttpWebRequest.<>c__DisplayClass5.<EndGetResponse>b__4(Object sendState)
  at System.Net.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(Object sendState)}
   Message: ""
   Source: "System.Windows"
   StackTrace: "   at System.Net.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)\r\n   at System.Net.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)\r\n   at Intellidimension.RdfEntity.Service.RemoteEntityServiceProviderClient.getProviderMetadataResponse(IAsyncResult result)\r\n   at System.Net.BrowserHttpWebRequest.<>c__DisplayClassd.<InvokeGetResponseCallback>b__b(Object state2)\r\n   at System.Threading._ThreadPoolWaitCallback.WaitCallback_Context(Object state)\r\n   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)\r\n   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)\r\n   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)"
   System.Runtime.InteropServices._Exception.HelpLink: null
   System.Runtime.InteropServices._Exception.Source: "System.Windows"

Answer 1

Silverlight unterstützt nur Einstellung Header der POST-Methode nicht die GET-Methode verwendet wird. Dies ist aufgrund einer Einschränkung, wie das TCP / IP-Stack wird in Silverlight implementiert. Es verwendet die Browser-Erweiterung APIs statt OS APIs direkt gegen den Host gehen.

Answer 2

Geben Sie "Client HTTP" Umgang mit , bevor Sie rufen Sie initiieren WebRequest.

Wie folgt aus:

bool httpResult = WebRequest.RegisterPrefix("http://", WebRequestCreator.ClientHttp);
bool httpsResult = WebRequest.RegisterPrefix("https://", WebRequestCreator.ClientHttp);