Activate the HTTP cache on WordPress

1. Install the WP Super Cache plugin in the WordPress administration interface. Activate it, then the cache in its settings:

Numerous settings can be modified later.

2. Activate the HTTP cache on the website in Web > Sites > Modify the [site] - ⚙️ > Cache.

3. Check whether the cache is activated:

• once on the WordPress home page, open the developer panel on your browser, under the Network menu. Search for the Age header.

• or by using curl -I:

$ curl -I https://httpcache.alwaysdata.net
HTTP/2 200 
date: Wed, 01 Dec 2021 16:04:55 GMT
server: Apache
vary: Accept-Encoding,Cookie

cache-control: max-age=3, must-revalidate

content-type: text/html; charset=UTF-8
via: 2.0 alproxy

If your site returns the header cache-control: max-age=0, it is not cached.