Pragma
The 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.
Note: 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
HTTP/1.0 clients.
| Header type | Request header, Response header (response behavior is not specified and thus implementation-specific). |
|---|---|
| Forbidden header name | no |
| CORS-safelisted response header | yes |
Syntax
Pragma: no-cache
Directives
- no-cache
-
Same as
Cache-Control: no-cache. Forces caches to submit the request to the origin server for validation before releasing a cached copy.
Examples
Pragma: no-cache
Specifications
| Specification |
|---|
| Hypertext Transfer Protocol (HTTP/1.1): Caching (HTTP/1.1) # header.pragma |
Browser compatibility
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