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Caching

Pragma

Legacy HTTP/1.0 header for backward-compatible cache control. Replaced by Cache-Control.

Syntax

Pragma: no-cache

Example

Pragma: no-cache

Description

Pragma is a legacy HTTP/1.0 cache control mechanism. Only standard value: no-cache.

Exists for backward compatibility. In modern HTTP/1.1+ use Cache-Control instead.

For old HTTP/1.0 clients, include both Pragma: no-cache and Cache-Control: no-cache.

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Related Headers

Age
Indicates how long a response has been stored in a cache, in seconds since generation.
Cache-Control
The primary header for controlling caching behavior, defining how and for how long responses can be cached.
Expires
Specifies a date/time after which the response is considered stale. Superseded by Cache-Control max-age.
Vary
Tells caches which request headers to consider when deciding whether to serve a cached response.

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