Pragma header
Deprecated
Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.
The HTTP Pragma header is an implementation-specific header that may have various effects along the request-response chain.
This header serves for backwards compatibility with HTTP/1.0 caches that do not support the Cache-Control HTTP/1.1 header.
Note:
The Pragma header is not specified for HTTP responses and is therefore not a reliable replacement for the 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 HTTP/1.0 clients.
| Header type | Request header, Response header (response behavior is not specified and is implementation-specific). |
|---|---|
| Forbidden request header | 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 a cached copy is released.
Examples
Pragma: no-cache
Specifications
| Specification |
|---|
| HTTP Caching # field.pragma |