Why am I getting a "CORS" error when I send a request with the "X-Unique-Salt" header?

Question

CORS

Why am I getting a "CORS" error when I send a request with the "X-Unique-Salt" header?

The error occurs only when sending a header with "X-"

"Rest API" and "Front-end (react)" is on the same server and on the same IP address

Answer 1

CORS - you can read more carefully how the browser works with cors. It's not the title X-{...}, but the fact that it's custom.
And you, I will assume, either different ports, or https <-> httpwith the same ip