I'm trying to make a POST request between two sites.
I've seen the need to change header of request on server side using the access-allow. My problem is that when I send request I can't see this modification in the response header.
If I go on directly on page the headers are change. If I sent request with GET, I can see too that the headers has been changed. Maybe there is server configuration of http which is forbidden across domain POST request?
I'm using a Ngnix server that serves Drupal sites.