https://symfony.com/doc/6.0/http_cache/ssi.html
Working with Server Side Includes: In a similar way as ESI (Edge Side Includes), SSI can be used to control HTTP caching on fragments of a response. The most...
server side includesworkingsymfonydocs
https://www.hostpapa.com/knowledgebase/support-for-ssi-server-side-includes/
HostPapa does support SSI. SSI is a simple server-side scripting language, generally used for the web. Learn more here.
server side includessupportssihostpapa