This documentation is archived and is not being maintained.

HttpResponse.HeaderEncoding Property

Gets or sets an Encoding object that represents the encoding for the current header output stream.

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

public Encoding HeaderEncoding { get; set; }

Property Value

Type: System.Text.Encoding
An Encoding that contains information about the character set for the current header.


The encoding value is null.


The encoding value is Unicode.

- or -

The headers have already been sent.

The HeaderEncoding property gives you the ability to disable or change the Encoding object on a response header by using the ASCIIEncoding, UnicodeEncoding, UTF7Encoding, or UTF8Encoding object. The default encoding value is the UTF8Encoding class.

By changing the type of the HeaderEncoding property, you can potentially increase the risk of certain malicious attacks or cause sensitive data to be sent through the response header. Header injection attacks can be avoided, in part, by leaving the HeaderEncoding property of a response to the default setting. An attack against a vulnerable application could echo back entrusted data as part of a response header. If the HeaderEncoding is disabled because of a requirement for continuation lines in a header or if any header is constructed based on the result of untrusted data, the header data should be validated before sending to the response stream.

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