HttpWebResponse.GetResponseHeader メソッド

応答で返されたヘッダーの内容を取得します。

Public Function GetResponseHeader( _
   ByVal headerName As String _) As String
[C#]
public string GetResponseHeader(stringheaderName);
[C++]
public: String* GetResponseHeader(String* headerName);
[JScript]
public function GetResponseHeader(
   headerName : String) : String;

パラメータ

• headerName
  返されるヘッダー値。

戻り値

指定したヘッダーの内容。

例外

例外の種類	条件
ObjectDisposedException	現在のインスタンスは破棄されています。

解説

GetResponseHeader を使用して、特定のヘッダーの内容を取得します。どのヘッダーを返すかを指定する必要があります。

使用例

[Visual Basic, C#, C++] この例では、Web 要求を作成し、応答を問い合わせます。サイトが認証を必要とする場合、この例では、チャレンジ文字列で応答します。この文字列は、 GetResponseHeader を使用して抽出されます。

 
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 

[C#] 
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);
     }
 }
}

[C++] 
void GetPage(String* url) {
   try {
      Uri* ourUri = new Uri(url);
      // Creates an HttpWebRequest for the specified URL.
      HttpWebRequest* myHttpWebRequest =
         dynamic_cast<HttpWebRequest*>(WebRequest::Create(ourUri));
      HttpWebResponse* myHttpWebResponse =
         dynamic_cast<HttpWebResponse*>(myHttpWebRequest->GetResponse());
      Console::WriteLine(S"\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 = dynamic_cast<HttpWebResponse*>(e->Response);
      if (response != 0) {
         if (response->StatusCode == HttpStatusCode::Unauthorized) {
            String* challenge = 0;
            challenge= response->GetResponseHeader(S"WWW-Authenticate");
            if (challenge != 0)
               Console::WriteLine(S"\nThe following challenge was raised by the server: {0}",
               challenge);
         } else
            Console::WriteLine(S"\nThe following WebException was raised : {0}",
            e->Message);
      } else
         Console::WriteLine(S"\nResponse Received from server was 0");

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

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET, Common Language Infrastructure (CLI) Standard

参照

HttpWebResponse クラス | HttpWebResponse メンバ | System.Net 名前空間