Ajax returns the same requests with php, how to fix?

Question

PHP

I have created a script on js that sends a fail.php request to the server using ajax (the page does not reload) and gives a response, in php itself there is a code that should give ajax a new response every time, but this does not happen, it turns out the same same. To avoid this, you have to reload the entire page. How to solve it?

Answer 1

Read about caching. Well, show me the code.

Answer 2

Use POST or send headers to the browser that prohibit caching. If you request with a timestamp or a random number regularly, then the user's cache will become clogged.