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 Pragma is a no-cache general-type CORS-safe listed response header field in an HTTP/1.0 header which is intended to use in the request-response chain. A pragma header meant to prevent the client from caching the response, pragma means the browsers to tell the server and any intermediate caches that it wants a fresh version of the resource and vice-versa is not true.
Syntax
Directives: It is same as Cache-Control: no-cache header. It forces the caches to submit the request to the origin server for validation before releasing a cached copy.
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