WebHeaderCollection.IsRestricted Método

Referencia

Definición

Espacio de nombres:: System.Net

Ensamblado:: System.Net.WebHeaderCollection.dll

Ensamblado:: System.dll

Ensamblado:: netstandard.dll

Importante

Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.

Comprueba si se puede establecer el encabezado HTTP especificado.

Sobrecargas

IsRestricted(String)	Comprueba si el encabezado HTTP especificado se puede establecer para la solicitud.
IsRestricted(String, Boolean)	Comprueba si el encabezado HTTP especificado se puede establecer para la solicitud o la respuesta.

IsRestricted(String)

Source:: WebHeaderCollection.cs

Source:: WebHeaderCollection.cs

Source:: WebHeaderCollection.cs

Comprueba si el encabezado HTTP especificado se puede establecer para la solicitud.

public:
 static bool IsRestricted(System::String ^ headerName);

public static bool IsRestricted (string headerName);

static member IsRestricted : string -> bool

Public Shared Function IsRestricted (headerName As String) As Boolean

Parámetros

headerName: String

Encabezado que se va a comprobar.

Devoluciones

Boolean

Es true si el encabezado es restringido; de lo contrario, es false.

Excepciones

ArgumentNullException

headerName es null o Empty.

ArgumentException

headerName contiene caracteres no válidos.

Ejemplos

En el ejemplo siguiente se comprueba la IsRestricted propiedad para ver si se prohíbe establecer algún encabezado.

try
{
   // Create a web request for S"www.msn.com".
   HttpWebRequest^ myHttpWebRequest = dynamic_cast<HttpWebRequest^>(WebRequest::Create( "http://www.msn.com" ));

   // Get the associated response for the above request.
   HttpWebResponse^ myHttpWebResponse = dynamic_cast<HttpWebResponse^>(myHttpWebRequest->GetResponse());

   // Get the headers associated with the response.
   WebHeaderCollection^ myWebHeaderCollection = myHttpWebResponse->Headers;
   for ( int i = 0; i < myWebHeaderCollection->Count; i++ )
   {
      // Check if the first response header is restriced.
      if ( WebHeaderCollection::IsRestricted( dynamic_cast<String^>(myWebHeaderCollection->AllKeys[ i ]) ) )
               Console::WriteLine( "' {0}' is a restricted header", myWebHeaderCollection->AllKeys[ i ] );
      else
               Console::WriteLine( "' {0}' is not a restricted header", myWebHeaderCollection->AllKeys[ i ] );
   }
   myHttpWebResponse->Close();
}
catch ( WebException^ e ) 
{
   Console::WriteLine( "\nWebException is thrown.\nMessage is: {0}", e->Message );
   if ( e->Status == WebExceptionStatus::ProtocolError )
   {
      Console::WriteLine( "Status Code : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->StatusCode );
      Console::WriteLine( "Status Description : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->StatusDescription );
      Console::WriteLine( "Server : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->Server );
   }
}
catch ( Exception^ e ) 
{
   Console::WriteLine( "Exception is thrown. Message is : {0}", e->Message );
}

    try {
        // Create a web request for "www.msn.com".
        HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("http://www.msn.com");

        // Get the associated response for the above request.
        HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();

        // Get the headers associated with the response.
        WebHeaderCollection myWebHeaderCollection = myHttpWebResponse.Headers;
        
        for (int i = 0; i < myWebHeaderCollection.Count;i++)	
        {
        // Check if the first response header is restricted.
        if(WebHeaderCollection.IsRestricted(myWebHeaderCollection.AllKeys[i]))
            Console.WriteLine("'{0}' is a restricted header", myWebHeaderCollection.AllKeys[i]);
        else
            Console.WriteLine("'{0}' is not a restricted header", myWebHeaderCollection.AllKeys[i]);
        }
        myHttpWebResponse.Close();
    }
    catch(WebException e) {
        Console.WriteLine("\nWebException is thrown.\nMessage is:" + e.Message);
        if(e.Status == WebExceptionStatus.ProtocolError) {
            Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
            Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
            Console.WriteLine("Server : {0}", ((HttpWebResponse)e.Response).Server);
        }
    }
    catch(Exception e) {
        Console.WriteLine("Exception is thrown. Message is :" + e.Message);
    }
}

Public Shared Sub Main()
Try
        'Create a web request for "www.msn.com".
        Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.msn.com"), HttpWebRequest)
        
        'Get the associated response for the above request.
        Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        
        'Get the headers associated with the response.
        Dim myWebHeaderCollection As WebHeaderCollection = myHttpWebResponse.Headers
        
        'Check if the first response header is restricted.
    dim i as integer
    for i =0 to myWebHeaderCollection.Count-1
            If WebHeaderCollection.IsRestricted(myWebHeaderCollection.AllKeys(i)) Then
                Console.WriteLine("'{0}' is a restricted header", myWebHeaderCollection.AllKeys(i))
            Else
                Console.WriteLine("'{0}' is not a restricted header", myWebHeaderCollection.AllKeys(i))
            End If 
    next
    myHttpWebResponse.Close()
    Catch e As WebException
        Console.WriteLine(e.Message)
        If e.Status = WebExceptionStatus.ProtocolError Then
            Console.WriteLine("Status Code : {0}", CType(e.Response, HttpWebResponse).StatusCode)
            Console.WriteLine("Status Description : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
            Console.WriteLine("Server : {0}", CType(e.Response, HttpWebResponse).Server)
        End If
    Catch e As Exception
        Console.WriteLine(e.Message)
    End Try
End Sub

Comentarios

El IsRestricted método devuelve true para indicar que un encabezado está restringido y debe establecerse mediante propiedades en lugar de directamente o se establece mediante el sistema. Los encabezados restringidos son:

Aceptar
Conexión
Content-Length
Content-Type
Date
Expect
administrador de flujos de trabajo
If-Modified-Since
Intervalo
Referer
Transfer-Encoding
User-Agent
Proxy-Connection

Se aplica a

IsRestricted(String, Boolean)

Source:: WebHeaderCollection.cs

Source:: WebHeaderCollection.cs

Source:: WebHeaderCollection.cs

Comprueba si el encabezado HTTP especificado se puede establecer para la solicitud o la respuesta.

public:
 static bool IsRestricted(System::String ^ headerName, bool response);

public static bool IsRestricted (string headerName, bool response);

static member IsRestricted : string * bool -> bool

Public Shared Function IsRestricted (headerName As String, response As Boolean) As Boolean

Parámetros

headerName: String

Encabezado que se va a comprobar.

response: Boolean

true para probar la respuesta; false para probar la solicitud.

Devoluciones

Boolean

Es true si el encabezado está restringido; de lo contrario, es false.

Excepciones

ArgumentNullException

headerName es null o Empty.

ArgumentException

headerName contiene caracteres no válidos.

Ejemplos

En el ejemplo siguiente se comprueba la IsRestricted propiedad para ver si se prohíbe establecer algún encabezado de solicitud.

try
{
   // Create a web request for S"www.msn.com".
   HttpWebRequest^ myHttpWebRequest = dynamic_cast<HttpWebRequest^>(WebRequest::Create( "http://www.msn.com" ));

   // Get the associated response for the above request.
   HttpWebResponse^ myHttpWebResponse = dynamic_cast<HttpWebResponse^>(myHttpWebRequest->GetResponse());

   // Get the headers associated with the response.
   WebHeaderCollection^ myWebHeaderCollection = myHttpWebResponse->Headers;
   for ( int i = 0; i < myWebHeaderCollection->Count; i++ )
   {
      // Check if the first response header is restriced.
      if ( WebHeaderCollection::IsRestricted( dynamic_cast<String^>(myWebHeaderCollection->AllKeys[ i ]) ) )
               Console::WriteLine( "' {0}' is a restricted header", myWebHeaderCollection->AllKeys[ i ] );
      else
               Console::WriteLine( "' {0}' is not a restricted header", myWebHeaderCollection->AllKeys[ i ] );
   }
   myHttpWebResponse->Close();
}
catch ( WebException^ e ) 
{
   Console::WriteLine( "\nWebException is thrown.\nMessage is: {0}", e->Message );
   if ( e->Status == WebExceptionStatus::ProtocolError )
   {
      Console::WriteLine( "Status Code : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->StatusCode );
      Console::WriteLine( "Status Description : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->StatusDescription );
      Console::WriteLine( "Server : {0}", (dynamic_cast<HttpWebResponse^>(e->Response))->Server );
   }
}
catch ( Exception^ e ) 
{
   Console::WriteLine( "Exception is thrown. Message is : {0}", e->Message );
}

    try {
        // Create a web request for "www.msn.com".
        HttpWebRequest myHttpWebRequest = (HttpWebRequest) WebRequest.Create("http://www.msn.com");

        // Get the associated response for the above request.
        HttpWebResponse myHttpWebResponse = (HttpWebResponse) myHttpWebRequest.GetResponse();

        // Get the headers associated with the response.
        WebHeaderCollection myWebHeaderCollection = myHttpWebResponse.Headers;
        
        for (int i = 0; i < myWebHeaderCollection.Count;i++)	
        {
        // Check if the first response header is restricted.
        if(WebHeaderCollection.IsRestricted(myWebHeaderCollection.AllKeys[i]))
            Console.WriteLine("'{0}' is a restricted header", myWebHeaderCollection.AllKeys[i]);
        else
            Console.WriteLine("'{0}' is not a restricted header", myWebHeaderCollection.AllKeys[i]);
        }
        myHttpWebResponse.Close();
    }
    catch(WebException e) {
        Console.WriteLine("\nWebException is thrown.\nMessage is:" + e.Message);
        if(e.Status == WebExceptionStatus.ProtocolError) {
            Console.WriteLine("Status Code : {0}", ((HttpWebResponse)e.Response).StatusCode);
            Console.WriteLine("Status Description : {0}", ((HttpWebResponse)e.Response).StatusDescription);
            Console.WriteLine("Server : {0}", ((HttpWebResponse)e.Response).Server);
        }
    }
    catch(Exception e) {
        Console.WriteLine("Exception is thrown. Message is :" + e.Message);
    }
}

Public Shared Sub Main()
Try
        'Create a web request for "www.msn.com".
        Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create("http://www.msn.com"), HttpWebRequest)
        
        'Get the associated response for the above request.
        Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
        
        'Get the headers associated with the response.
        Dim myWebHeaderCollection As WebHeaderCollection = myHttpWebResponse.Headers
        
        'Check if the first response header is restricted.
    dim i as integer
    for i =0 to myWebHeaderCollection.Count-1
            If WebHeaderCollection.IsRestricted(myWebHeaderCollection.AllKeys(i)) Then
                Console.WriteLine("'{0}' is a restricted header", myWebHeaderCollection.AllKeys(i))
            Else
                Console.WriteLine("'{0}' is not a restricted header", myWebHeaderCollection.AllKeys(i))
            End If 
    next
    myHttpWebResponse.Close()
    Catch e As WebException
        Console.WriteLine(e.Message)
        If e.Status = WebExceptionStatus.ProtocolError Then
            Console.WriteLine("Status Code : {0}", CType(e.Response, HttpWebResponse).StatusCode)
            Console.WriteLine("Status Description : {0}", CType(e.Response, HttpWebResponse).StatusDescription)
            Console.WriteLine("Server : {0}", CType(e.Response, HttpWebResponse).Server)
        End If
    Catch e As Exception
        Console.WriteLine(e.Message)
    End Try
End Sub

Comentarios

El IsRestricted método devuelve true para indicar que un encabezado de solicitud o respuesta está restringido y debe establecerse mediante propiedades en lugar de directamente o se establece por el sistema. Los encabezados restringidos son:

Aceptar
Conexión
Content-Length
Content-Type
Date
Expect
administrador de flujos de trabajo
If-Modified-Since
Intervalo
Referer
Transfer-Encoding
User-Agent
Proxy-Connection

Se aplica a

WebHeaderCollection.IsRestricted Método

Definición

Sobrecargas

IsRestricted(String)

Parámetros

Devoluciones

Excepciones

Ejemplos

Comentarios

Se aplica a

IsRestricted(String, Boolean)

Parámetros

Devoluciones

Excepciones

Ejemplos

Comentarios

Se aplica a

Comentarios

Recursos adicionales