$date = gmdate("D, j M Y H:i:s", $lastModifiedTimestamp).
ADDING PUBLIC PRIVATE CACHE HEADER HOW TO
Fetching the last modified time of the XML file Cache-Control is a header that you can configure your web server to add to all outgoing requests, which will tell the browser and CDNs how to cache your content. Private static function SetLastModifiedHeader($lastModifiedTimestamp, $maxAge) For example, a visitor’s browser, a CDN, etc. The public directive means that the resource can be stored by any cache. The public and private directives are two opposing directives that control which types of clients can cache resources. Header("Cache-Control: public, max-age=$maxAge", true) cache-control: public and cache-control: private. Header("HTTP/1.1 304 Not Modified", true) Private static function SetNotModifiedHeader($maxAge) But when serving to users, I don't want it to send the cache as Public anymore, but set. I have an Nginx cache server getting content from an origin server, the origin server sets Cache-Control to Public so my Nginx cache server can cache the content and make less requests to origin. If ($sinceTimestamp != false & $lastModifiedTimestamp <= $sinceTimestamp) Alter Nginx reverse proxy cache header from Public to Private. Can the browser get it from the cache? public, but you cannot even store this header, but as I said, I cant think of. Allowed values PUBLIC PRIVATE NO-CACHE NO-STORE. Some information on the Cache-Control header is as follows HTTP 1.1.
The value in the content field is defined as one of the four values below.
$sinceTimestamp = strtotime($gmtSinceDate) (3) We add Cache-control: no-store, which applies to the entire message. 8 Answers Sorted by: 233 To use cache-control in HTML, you use the meta tag, e.g. If (array_key_exists("If-Modified-Since", $allHeaders)) You get a system that can break apart a page into public and private pieces, cache each piece appropriately, and then re-compose the full-page content from the relevant caches and serve. Combine these two elements and you get something very powerful. Private static function IsModifiedSince($lastModifiedTimestamp) LiteSpeed Web Server allows you to store content in either the public cache or a private cache. Self::SetLastModifiedHeader($lastModifiedTimestamp, $maxAge) If (self::IsModifiedSince($lastModifiedTimestamp))
Public static function Init($lastModifiedTimestamp, $maxAge) It has a static function called 'Init' that needs 2 parameters, a timestamp of the date that the page (or any other file requested by the browser) was last modified and the maximum age, in seconds, that this page can be held in cache by the browser. Here's a small class that does http caching for you.
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