HttpWebResponse.GetResponseHeader-Methode

Ruft den Inhalt eines Headers ab, der mit der Antwort zurückgegeben wurde.

Namespace: System.Net
Assembly: System (in system.dll)

Syntax

'Declaration
Public Function GetResponseHeader ( _
    headerName As String _
) As String
'Usage
Dim instance As HttpWebResponse
Dim headerName As String
Dim returnValue As String

returnValue = instance.GetResponseHeader(headerName)

public string GetResponseHeader (
    string headerName
)

public:
String^ GetResponseHeader (
    String^ headerName
)

public String GetResponseHeader (
    String headerName
)

public function GetResponseHeader (
    headerName : String
) : String

Parameter

• headerName
  Der zurückzugebende Headerwert.

Rückgabewert

Der Inhalt des angegebenen Headers.

Ausnahmen

Hinweise

Mit GetResponseHeader können Sie den Inhalt eines bestimmten Headers abrufen. Sie müssen angeben, welchen Header Sie zurückgeben möchten.

Beispiel

In diesem Beispiel wird eine Webanforderung erstellt und eine Antwort abgefragt. Wenn für die Site eine Authentifizierung erforderlich ist, wird im Beispiel mit einer Aufforderungszeichenfolge darauf reagiert. Diese Zeichenfolge wird mit GetResponseHeader extrahiert.

Public Shared Sub GetPage(url As [String])
Try
        Dim ourUri As New Uri(url)
        ' Creates an HttpWebRequest for the specified URL. 
        Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(ourUri), HttpWebRequest)
        Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        Console.WriteLine(ControlChars.NewLine + "The server did not issue any challenge.  Please try again with a protected resource URL.")
        ' Releases the resources of the response.
        myHttpWebResponse.Close()
    Catch e As WebException
        Dim response As HttpWebResponse = CType(e.Response, HttpWebResponse)
        If Not (response Is Nothing) Then
            If response.StatusCode = HttpStatusCode.Unauthorized Then
                Dim challenge As String = Nothing
                challenge = response.GetResponseHeader("WWW-Authenticate")
                If Not (challenge Is Nothing) Then
                    Console.WriteLine(ControlChars.NewLine + "The following challenge was raised by the server:{0}", challenge)
                End If
            Else
                Console.WriteLine(ControlChars.NewLine + "The following exception was raised : {0}", e.Message)
            End If
        Else
            Console.WriteLine(ControlChars.NewLine + "Response Received from server was null")
        End If 
    Catch e As Exception
        Console.WriteLine(ControlChars.NewLine + "The following exception was raised : {0}", e.Message)
    End Try
End Sub 

   public static void GetPage(String url) 
    {
    try 
            {   
                Uri ourUri = new Uri(url);
                // Creates an HttpWebRequest for the specified URL. 
                HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(ourUri); 
                HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
                Console.WriteLine("\nThe server did not issue any challenge.  Please try again with a protected resource URL.");
                // Releases the resources of the response.
                myHttpWebResponse.Close(); 
            } 
        catch(WebException e) 
           {
                HttpWebResponse response = (HttpWebResponse)e.Response;
                if (response != null)
                {
                    if (response.StatusCode == HttpStatusCode.Unauthorized)
                    {
                        string challenge = null;
                        challenge= response.GetResponseHeader("WWW-Authenticate");
                        if (challenge != null)
                            Console.WriteLine("\nThe following challenge was raised by the server:{0}",challenge);
                    }
                    else
                        Console.WriteLine("\nThe following WebException was raised : {0}",e.Message);
                }
                else
                    Console.WriteLine("\nResponse Received from server was null");

            }
        catch(Exception e)
        {
            Console.WriteLine("\nThe following Exception was raised : {0}",e.Message);
        }
    }
}

void GetPage( String^ url )
{
   try
   {
      Uri^ ourUri = gcnew Uri( url );
      // Creates an HttpWebRequest for the specified URL.
      HttpWebRequest^ myHttpWebRequest = (HttpWebRequest^)( WebRequest::Create( ourUri ) );
      HttpWebResponse^ myHttpWebResponse = (HttpWebResponse^)( myHttpWebRequest->GetResponse() );
      Console::WriteLine( "\nThe server did not issue any challenge.  Please try again with a protected resource URL." );
      // Releases the resources of the response.
      myHttpWebResponse->Close();
   }
   catch ( WebException^ e ) 
   {
      HttpWebResponse^ response = (HttpWebResponse^)( e->Response );
      if ( response != nullptr )
      {
         if ( response->StatusCode == HttpStatusCode::Unauthorized )
         {
            String^ challenge = nullptr;
            challenge = response->GetResponseHeader( "WWW-Authenticate" );
            if ( challenge != nullptr )
                        Console::WriteLine( "\nThe following challenge was raised by the server: {0}", challenge );
         }
         else
         {
            Console::WriteLine( "\nThe following WebException was raised : {0}", e->Message );
         }
      }
      else
      {
         Console::WriteLine( "\nResponse Received from server was 0" );
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nThe following Exception was raised : {0}", e->Message );
   }
}

    public static void GetPage(String url)
    {
        try {
            Uri ourUri = new Uri(url);
            // Creates an HttpWebRequest for the specified URL. 
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)
                WebRequest.Create(ourUri);
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)
                myHttpWebRequest.GetResponse();
            Console.WriteLine("\nThe server did not issue any challenge.  "
                + "Please try again with a protected resource URL.");
            // Releases the resources of the response.
            myHttpWebResponse.Close();
        }
        catch (WebException e) {
            HttpWebResponse response = (HttpWebResponse)e.get_Response();
            if (response != null) {
                if (response.get_StatusCode().Equals(HttpStatusCode.
                    Unauthorized)) {
                    String challenge = null;
                    challenge = response.GetResponseHeader("WWW-Authenticate");
                    if (challenge != null) {
                        Console.WriteLine("\nThe following challenge was "
                            + "raised by the server:{0}", challenge);
                    }
                }
                else {
                    Console.WriteLine("\nThe following WebException "
                        + "was raised : {0}", e.get_Message());
                }
            }
            else {
                Console.WriteLine("\nResponse Received from server was null");
            }
        }
        catch (System.Exception e) {
            Console.WriteLine("\nThe following Exception was raised : {0}",
                e.get_Message());
        }
    } //GetPage
} //HttpWebResponseSnippet

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

HttpWebResponse-Klasse
HttpWebResponse-Member
System.Net-Namespace