Caching
Pragma
Legacy HTTP/1.0 header for backward-compatible cache control. Replaced by Cache-Control.
Syntax
Pragma: no-cacheExample
Pragma: no-cacheDescription
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.
How real sites send this header
Home-page responses of 503 popular sites from the enterno.io /check catalogue, checked in the last 30 days.
14.3%
(72 of 503) send Pragma.
Most common values:
no-cache— 68 sitespublic— 2 sites
See it on: yandex.ru, habr.com, amocrm.ru, auto.ru, alibaba.com
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