Gets the list of all HTTP headers that will be used to vary cache output.
Assembly: System.Web (in System.Web.dll)
When a cached item has several vary headers, a separate version of the requested document is available from the cache for each HTTP header type.
is introduced in the .NET Framework version 3.5. For more information, see .NET Framework Versions and Dependencies.
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.