404 strict-origin-when-cross-origin

Question

I'm trying to insert user data from my react app.
React:
<form method="POST" action="my.php">
and request via axios.
I run wamp server with a my.php (store data in mysql-db) in www folder.
When I run my.php, the data is stored in mysql-database, but when I submit the form in react, which is supposed to run my.php, I get the error in the title of my post.
So the problem is about CORS?
Also when I submit my form from react to my django backend, it worked well, after I added allowed-origin in django.
So I think, I have to allow cross-origin in my apache server(?). But how? Any exp with that? Tutorials?

Answer 1

Thank you.
I have tried that before, but it didn't work. I went back to django, but I'll try again in a few days.