Nginx cors

cors_errors.txt

The cors headers in nginx.conf fixes the errors:

# firefox
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://example.com/. (Reason: CORS request did not succeed)

# safari
Failed to load resource: Origin http://example.com/ is not allowed by Access-Control-Allow-Origin.
Fetch API cannot load https:/remote.example.com. Origin http://example.com/ is not allowed by Access-Control-Allow-Origin.

nginx.conf

server {
        listen 80;
        server_name example.com;

        location / {
                add_header 'Access-Control-Allow-Origin' $http_origin;
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
                add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';

                if ($request_method = 'OPTIONS') {
                        add_header 'Access-Control-Allow-Origin' $http_origin;
                        add_header 'Access-Control-Allow-Credentials' 'true';
                        add_header 'Access-Control-Allow-Headers' 'Authorization,Accept,Origin,DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Content-Range,Range';
                        add_header 'Access-Control-Allow-Methods' 'GET,POST,OPTIONS,PUT,DELETE,PATCH';
                        add_header 'Access-Control-Max-Age' 1728000;
                        add_header 'Content-Type' 'text/plain charset=UTF-8';
                        add_header 'Content-Length' 0;
                        return 204;
                }


                proxy_pass https://upstream_server/;
                more_clear_headers 'Access-Control-Allow-Origin';
        }
}