HttpWebResponse.GetResponseHeader(String) Metode

Definisi

Ruang nama:

System.Net

Rakitan:

System.Net.Requests.dll

Sumber:

HttpWebResponse.cs

Mendapatkan konten header yang dikembalikan dengan respons.

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

Parameter

headerName

String

Nilai header yang akan dikembalikan.

Mengembalikan

String

Konten header yang ditentukan.

Pengecualian

ObjectDisposedException

Instans saat ini telah dibuang.

Contoh

Contoh ini membuat permintaan Web dan kueri untuk respons. Jika situs memerlukan autentikasi, contoh ini akan merespons dengan string tantangan. String ini diekstrak menggunakan 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

Keterangan

Gunakan GetResponseHeader untuk mengambil konten header tertentu. Anda harus menentukan header mana yang ingin Anda kembalikan.