Pragma HTTP/1.0 general header is an
implementation-specific header that may have various effects along the request-response
chain. This header serves for backwards compatibility with the HTTP/1.0 caches that do not have a
Cache-Control HTTP/1.1 header.
Pragma is not specified for HTTP responses and is
therefore not a reliable replacement for the general HTTP/1.1
Cache-Control header, although its behavior is the same as
Cache-Control: no-cache if the
Cache-Control header field
is omitted in a request. Use
Pragma only for backwards compatibility with
Cache-Control: no-cache. Forces caches to submit the request to the origin server for validation before a cached copy is released.
|Hypertext Transfer Protocol (HTTP/1.1): Caching |
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