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

BCD tables only load in the browser

See also