Pragma
Pragma
The 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.
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 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 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 a cached copy is released.
Examples
Pragma: no-cache
Specifications
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
Pragma |
Yes |
12 |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
Yes |
See also
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Pragma