Share via

HttpCacheability Enum


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

public enum class HttpCacheability
public enum HttpCacheability
type HttpCacheability = 
Public Enum HttpCacheability


NoCache 1

Sets 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.

Private 2

Default value. Sets Cache-Control: private to specify that the response is cacheable only on the client and not by shared (proxy server) caches.

Public 4

Sets Cache-Control: public to specify that the response is cacheable by clients and shared (proxy) caches.

Server 3

Specifies 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.

ServerAndNoCache 3

Applies 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.

ServerAndPrivate 5

Indicates 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."


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

Applies to

See also