Gets or sets a value indicating whether the ASP.NET output cache varies the cached responses by the User-Agent header, and appends it to the out-going Vary HTTP header.
Assembly: System.Web (in System.Web.dll)
The Vary header indicates the request-header fields that the server uses to determine which of multiple cached responses is sent in response to a client request. The User-Agent field specifies that the server selects the response based on the client's user-agent type.
For more information, see RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, available on the World Wide Web Consortium (W3C) Web site. See section 14, "Header Field Definitions", for complete details.