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HttpWebRequest.MaximumResponseHeadersLength Property

Gets or sets the maximum allowed length of the response headers.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Property MaximumResponseHeadersLength As Integer
'Usage
Dim instance As HttpWebRequest 
Dim value As Integer 

value = instance.MaximumResponseHeadersLength

instance.MaximumResponseHeadersLength = value

Property Value

Type: System.Int32
The length, in kilobytes (1024 bytes), of the response headers.

ExceptionCondition
InvalidOperationException

The property is set after the request has already been submitted.

ArgumentOutOfRangeException

The value is less than 0 and is not equal to -1.

The length of the response header includes the response status line and any extra control characters that are received as part of HTTP protocol. A value of -1 means no limit is imposed on the response headers; a value of 0 means that all requests fail.

If the MaximumResponseHeadersLength property is not explicitly set, it defaults to the value of the DefaultMaximumResponseHeadersLength property.

If the length of the response header received exceeds the value of the MaximumResponseHeadersLength property, the EndGetResponse or GetResponse methods will throw a WebException with the Status property set to MessageLengthLimit.

The following code example sets the value of this property.

Imports System
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 'Main
End Class 'Test

'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 <mscorlib.dll>
#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 ()
{
    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 (S"Content length is {0}", __box(response->ContentLength));
    Console::WriteLine (S"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 (S"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>

*/

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1

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