HttpWebResponse.GetResponseHeader(String) Méthode

Définition

Espace de noms:

System.Net

Assembly:

System.Net.Requests.dll

Source:

HttpWebResponse.cs

Obtient le contenu d'un en-tête qui a été retourné avec la réponse.

public:
 System::String ^ GetResponseHeader(System::String ^ headerName);

public string GetResponseHeader (string headerName);

member this.GetResponseHeader : string -> string

Public Function GetResponseHeader (headerName As String) As String

Paramètres

headerName

String

Valeur d'en-tête à retourner.

Retours

String

Contenu de l'en-tête spécifié.

Exceptions

ObjectDisposedException

L’instance actuelle a été supprimée.

Exemples

Cet exemple crée une requête web et interroge une réponse. Si le site nécessite une authentification, cet exemple répond avec une chaîne de défi. Cette chaîne est extraite à l’aide de GetResponseHeader.

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.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);
        }
    }
}

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

Remarques

Utilisez GetResponseHeader pour récupérer le contenu d’en-têtes particuliers. Vous devez spécifier l’en-tête que vous souhaitez retourner.