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Example code of rocketweb/cache-warmer

Informations about the package cache-warmer

Cache Warmer (for Fastly CDN)

Info

This library allows for faster Cache Warmup when dealing with CDN (Fastly CDN & Cloudflare supported so far). It uses HEAD request to check for Cache status. If Cache Status is not a HIT, then full page load is executed. By default, the page is parsed for css/js/img elements and all those get requested also!

It supports smart caching, so you are not requesting the same Page/Element over and over again!

Requests run in a rolling window: a fixed number of requests is always in flight, a slow response does not block the others. Connections are reused (HTTP/2 multiplexing when the server supports it). Every request advertises the same Accept-Encoding as a browser (br, gzip, ...), so the CDN cache variant real visitors get is the one being warmed.

Requires PHP 8.3+. On PHP 8.4+ pages are parsed with the HTML5 compliant Dom\HTMLDocument parser, on PHP 8.3 it falls back to DOMDocument.

Installation & Usage

This library can be installed using composer:

Once installed, you can load it up using standard PSR-4 call. Example code:

The output is echoed directly and contains the following information:

Configuration

There are few things that can be configured:

  1. you can set how many concurrent requests you want to execute to the server (applies to both Pages & Elements, default 10)

  2. You can bypass the CDN Cache result for certain URLs which will force the Page to be loaded & all Elements to be fetched!

  3. You can set up Alternative domains to be used when processing Elements on the Page (for example - your media is being served from different domain). You need to set that before calling ->run():

  4. You can specify custom header & value to be matched against for CDN Caching validation. The validation is done thru partial match (needle in haystack). You need to pass additional configuration into the ->run() method:

The configuration gets merged together with default values (that support Fastly & Cloudflare):

For example, if you want to include DYNAMIC to be passed as Cached for Cloudflare:

  1. You can skip loading Elements (js/img/css) and only warm up the pages listed by specifying the 4th argument of ->run() method:

About

This library was developed for internal usage.

All versions of cache-warmer with dependencies

PHP Build Version
Package Version
Requires php Version >=8.3
ext-curl Version *
ext-dom Version *
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