Strange HTML Response with AES Script When Calling My PHP API

the problem with the aes script was solved by itself, just as it appeared it disappeared, maybe it had something to do with the cookies since I deleted them and the cache a lot of times as @Greenreader mentioned, I no longer have any problems with the AES script, but just to clear up any doubts 100%, infinityfree does not limit calls to external APIs? like Google, openai, etc. to name a few, since the documentation https://forum.infinityfree.com/t/ensuring-only-web-browsers-can-access-your-website/49353 they have is not so clear, about what they are referring to when they say:

    • Access through Android or iOS mobile apps (mobile browsers work fine).
  • API access to websites (like WordPress XML-RPC).
  • Access from cURL or other command-line clients.
  • Website code validators and SEO checkers.
  • Domain ownership verification checks which look at website URLs or HTML code. Some webmasters tools and ad networks do this.
  • Let’s Encrypt and websites providing certificates through Let’s Encrypt (like sslforfree.com or zerossl.com).
  • AJAX requests from other websites (CORS). AJAX requests are only possible on the same (sub)domain.
  • Hotlinking and embedding images and other (static) files on other websites.

I would like, if possible and if it is not too much trouble, if you could explain each of these points to me in a better way, especially with the issue of AJAX calls or calls to external APIs.