CORS on Nginx

The following Nginx configuration enables CORS, with support for preflight requests.


#

# Wide-open CORS config for nginx

#

location / {

     if ($request_method = 'OPTIONS') {

        add_header 'Access-Control-Allow-Origin' '*';

        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';

        #

        # Custom headers and headers various browsers *should* be OK with but aren't

        #

        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';

        #

        # Tell client that this pre-flight info is valid for 20 days

        #

        add_header 'Access-Control-Max-Age' 1728000;

        add_header 'Content-Type' 'text/plain; charset=utf-8';

        add_header 'Content-Length' 0;

        return 204;

     }

     if ($request_method = 'POST') {

        add_header 'Access-Control-Allow-Origin' '*';

        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';

        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';

        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';

     }

     if ($request_method = 'GET') {

        add_header 'Access-Control-Allow-Origin' '*';

        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';

        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';

        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';

     }

}