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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)
public int MaximumResponseHeadersLength { get; set; }

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 MessageLengthLimitExceeded.

The following code example sets the value of this property.

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>

*/

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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