HttpWebRequest.MaximumResponseHeadersLength Property
Gets or sets the maximum allowed length of the response headers.
Namespace: System.Net
Assembly: System (in System.dll)
| Exception | Condition |
|---|---|
| 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.
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> ' '
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.
