!!! Overview
[{$pagename}] is an [HTTP Header Field] general-header field is used to specify [HTTP Cache Directives] that [MUST] be obeyed by all [HTTP] [Cache] mechanisms along the [HTTP Request]/[HTTP Response] chain.

Caching mechanisms would include [browsers], [user-agents], [WEB Agents WAM], [Proxy-Based WAM] and [Proxy Servers]

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Cache-Control|https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control|target='_blank'] - based on information obtained 2017-01-05