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HttpCacheability Enumeration

Provides enumerated values that are used to set the Cache-Control HTTP header.

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

type HttpCacheability

Member nameDescription
NoCacheSets the Cache-Control: no-cache header. Without a field name, the directive applies to the entire request and a shared (proxy server) cache must force a successful revalidation with the origin Web server before satisfying the request. With a field name, the directive applies only to the named field; the rest of the response may be supplied from a shared cache.
PrivateDefault value. Sets Cache-Control: private to specify that the response is cacheable only on the client and not by shared (proxy server) caches.
PublicSets Cache-Control: public to specify that the response is cacheable by clients and shared (proxy) caches.
ServerSpecifies that the response is cached only at the origin server. Similar to the NoCache option. Clients receive a Cache-Control: no-cache directive but the document is cached on the origin server. Equivalent to ServerAndNoCache.
ServerAndNoCacheApplies the settings of both Server and NoCache to indicate that the content is cached at the server but all others are explicitly denied the ability to cache the response.
ServerAndPrivateIndicates that the response is cached at the server and at the client but nowhere else. Proxy servers are not allowed to cache the response.

For more information, go to RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1, on the World Wide Web Consortium (W3C) Web site. In particular, for complete details, see Section 14.9 "Cache-Control" and Section 13, "Caching in HTTP."

NoteNote

NoCache does not send the common HTTP 1.0 request directive Pragma: no-cache.

TopicLocation
How to: Cache Versions of a Page Using HTTP HeadersBuilding ASP .NET Web Applications
How to: Set the Cacheability of an ASP.NET Page DeclarativelyBuilding ASP .NET Web Applications
How to: Set a Page's Cacheability ProgrammaticallyBuilding ASP .NET Web Applications
How to: Cache Page Output with File DependenciesBuilding ASP .NET Web Applications
How to: Cache Versions of a Page Using Requesting BrowserBuilding ASP .NET Web Applications
How to: Set Expiration Values for ASP.NET Page CachingBuilding ASP .NET Web Applications
How to: Cache Page Output with Cache Key DependenciesBuilding ASP .NET Web Applications
How to: Retrieve Values of Cached ItemsBuilding ASP .NET Web Applications
How to: Cache Versions of a Page Using HTTP HeadersBuilding ASP .NET Web Applications
How to: Set the Cacheability of an ASP.NET Page DeclarativelyBuilding ASP .NET Web Applications
How to: Set a Page's Cacheability ProgrammaticallyBuilding ASP .NET Web Applications
How to: Cache Page Output with File DependenciesBuilding ASP .NET Web Applications
How to: Cache Versions of a Page Using Requesting BrowserBuilding ASP .NET Web Applications
How to: Set Expiration Values for ASP.NET Page CachingBuilding ASP .NET Web Applications
How to: Cache Page Output with Cache Key DependenciesBuilding ASP .NET Web Applications
How to: Retrieve Values of Cached ItemsBuilding ASP .NET Web Applications

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 8.1, Windows Server 2012 R2, 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.

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