How to make it so that the request is only from the front?

Question

MySQL

I want to validate data from the form on the front so as not to load the server.
How can I make it so that the request to the server comes only from the front, but nothing else?

Answer 1

No way. You can use CSRF, but it is not 100% guaranteed. The backend must always check the incoming data itself.

Answer 2

No way.

Answer 3

Purely conditional, you can check Originfor example, but it's easy to fake it.
Also, normal people don't do client-only validation for the same reason.