Pragma HTTP/1.0 general header is an
implementation-specific header that may have various effects along the request-response
chain. It is used for backwards compatibility with HTTP/1.0 caches where the
Cache-Control HTTP/1.1 header is not yet present.
Pragma is not specified for HTTP responses and is
therefore not a reliable replacement for the general HTTP/1.1
Cache-Control header, although it does behave 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
|Header type||General header, but response behavior is not specified and thus implementation-specific.|
|Forbidden header name||no|
|CORS-safelisted response header||yes|
Cache-Control: no-cache. Forces caches to submit the request to the origin server for validation before releasing a cached copy.
|RFC 7234, section 5.4: Pragma||Hypertext Transfer Protocol (HTTP/1.1): Caching|
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