Gets or sets the OutputCacheProfile.VaryByHeader property.
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The OutputCacheProfile.VaryByHeader is a semicolon-delimited set of headers used to vary the cached output. These are HTTP headers associated with the request. For more information, see Caching Multiple Versions of a Page.
The OutputCacheProfile.VaryByHeader settings are the same ones used by the VaryByHeader attribute of the @ OutputCache. Varying by all headers by setting the value of "*" is not recommended. It can result in cache overflow or a denial of service attack on the Web server.