Access-Control-Allow-Origin Multiple Origin Domains?

Question

Is there a way to allow multiple cross-domains using the Access-Control-Allow-Origin header?

I\'m aware of the *, but it is too open. I rea

Answer 1

As mentioned above, Access-Control-Allow-Origin should be unique and Vary should be set to Origin if you are behind a CDN (Content Delivery Network).

Relevant part of my Nginx configuration:

if ($http_origin ~* (https?://.*\.mydomain.example(:[0-9]+)?)) {
  set $cors "true";
}
if ($cors = "true") {
  add_header 'Access-Control-Allow-Origin' "$http_origin";
  add_header 'X-Frame-Options' "ALLOW FROM $http_origin";
  add_header 'Access-Control-Allow-Credentials' 'true';
  add_header 'Vary' 'Origin';
}