Implement REST / HTTP calls within a page (snippets on 15.x)

[watery]

I’d like to make a page do some rest calls, I’ve never developed in XWiki, so I’m asking in advance.

Are the following snippets still compatible with 15.x, hence good to start with?

• https://snippets.xwiki.org/xwiki/bin/view/Extension/REST%20HTTP%20Client
• https://snippets.xwiki.org/xwiki/bin/view/Extension/Get%20URL%20content%20by%20post%20request/