Using AJAX on a file

I am creating a simple API to call methods from my php classes using JQuery and AJAX. I have a question how to enter the path in AJAX to refer to a given file from the Libraries echatspin echat directory

You can't access a file from the Libraries directory like that. Every requests needs to go through a controller. If you're not familiar with CI, take a look at the tutorial in the user guide.

CodeIgniter 4 tutorials (EN/FR) - https://includebeer.com
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