Pragma
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
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 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
| Specification |
|---|
| HTTP Caching # field.pragma |
Browser compatibility
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