HttpWebRequest.MaximumResponseHeadersLength Propriedade
Definição
Importante
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Obtém ou define o comprimento máximo permitido dos cabeçalhos de resposta.
public:
property int MaximumResponseHeadersLength { int get(); void set(int value); };public int MaximumResponseHeadersLength { get; set; }member this.MaximumResponseHeadersLength : int with get, setPublic Property MaximumResponseHeadersLength As IntegerValor da propriedade
O comprimento, em quilobytes (1024 bytes), dos cabeçalhos de resposta.
Exceções
A propriedade é definida depois que a solicitação já foi enviada.
O valor é menor que 0.
Exemplos
O exemplo de código a seguir define o valor dessa propriedade.
#using <System.dll>
using namespace System;
using namespace System::Net;
using namespace System::Text;
using namespace System::IO;
// Specify the URL to receive the request.
int main()
{
array<String^>^args = Environment::GetCommandLineArgs();
HttpWebRequest^ request = dynamic_cast<HttpWebRequest^>(WebRequest::Create(args[1]));
// Set some reasonable limits on resources used by this request
request->MaximumAutomaticRedirections = 4;
request->MaximumResponseHeadersLength = 4;
// Set credentials to use for this request.
request->Credentials = CredentialCache::DefaultCredentials;
HttpWebResponse^ response = dynamic_cast<HttpWebResponse^>(request->GetResponse());
Console::WriteLine("Content length is {0}", response->ContentLength);
Console::WriteLine("Content type is {0}", response->ContentType);
// Get the stream associated with the response.
Stream^ receiveStream = response->GetResponseStream();
// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader^ readStream = gcnew StreamReader(receiveStream, Encoding::UTF8);
Console::WriteLine("Response stream received.");
Console::WriteLine(readStream->ReadToEnd());
response->Close();
readStream->Close();
}
/*
The output from this example will vary depending on the value passed into Main
but will be similar to the following:
Content length is 1542
Content type is text/html; charset=utf-8
Response stream received.
<html>
...
</html>
*/
using System;
using System.Net;
using System.Text;
using System.IO;
public class Test
{
// Specify the URL to receive the request.
public static void Main (string[] args)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(args[0]);
// Set some reasonable limits on resources used by this request
request.MaximumAutomaticRedirections = 4;
request.MaximumResponseHeadersLength = 4;
// Set credentials to use for this request.
request.Credentials = CredentialCache.DefaultCredentials;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Console.WriteLine("Content length is {0}", response.ContentLength);
Console.WriteLine("Content type is {0}", response.ContentType);
// Get the stream associated with the response.
Stream receiveStream = response.GetResponseStream();
// Pipes the stream to a higher level stream reader with the required encoding format.
StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
Console.WriteLine("Response stream received.");
Console.WriteLine(readStream.ReadToEnd());
response.Close();
readStream.Close();
}
}
/*
The output from this example will vary depending on the value passed into Main
but will be similar to the following:
Content length is 1542
Content type is text/html; charset=utf-8
Response stream received.
<html>
...
</html>
*/
Imports System.Net
Imports System.Text
Imports System.IO
Public Class Test
' Specify the URL to receive the request.
Public Shared Sub Main(ByVal args() As String)
Dim request As HttpWebRequest = CType(WebRequest.Create(args(0)), HttpWebRequest)
' Set some reasonable limits on resources used by this request
request.MaximumAutomaticRedirections = 4
request.MaximumResponseHeadersLength = 4
' Set credentials to use for this request.
request.Credentials = CredentialCache.DefaultCredentials
Dim response As HttpWebResponse = CType(request.GetResponse(), HttpWebResponse)
Console.WriteLine("Content length is {0}", response.ContentLength)
Console.WriteLine("Content type is {0}", response.ContentType)
' Get the stream associated with the response.
Dim receiveStream As Stream = response.GetResponseStream()
' Pipes the stream to a higher level stream reader with the required encoding format.
Dim readStream As New StreamReader(receiveStream, Encoding.UTF8)
Console.WriteLine("Response stream received.")
Console.WriteLine(readStream.ReadToEnd())
response.Close()
readStream.Close()
End Sub
End Class
'
'The output from this example will vary depending on the value passed into Main
'but will be similar to the following:
'
'Content length is 1542
'Content type is text/html; charset=utf-8
'Response stream received.
'...
'
'
Comentários
Cuidado
WebRequest, HttpWebRequest, ServicePointe WebClient estão obsoletos e você não deve usá-los para um novo desenvolvimento. Em vez disso, use HttpClient.
O comprimento do cabeçalho de resposta inclui a linha de status de resposta e quaisquer caracteres de controle extras recebidos como parte do protocolo HTTP. Um valor de 0 significa que todas as solicitações falham.
Se a propriedade MaximumResponseHeadersLength não estiver definida explicitamente, ela usará como padrão o valor da propriedade DefaultMaximumResponseHeadersLength.
Se o comprimento do cabeçalho de resposta recebido exceder o valor da propriedade MaximumResponseHeadersLength, os métodos EndGetResponse ou GetResponse lançarão um WebException com a propriedade Status definida como MessageLengthLimitExceeded.
