nginX by default does not set CORS headers for requests with error status codes like 401. There are 2 options here to add CORS headers:

1- If your nginX version is new you have the option of always to add to add_header:

add_header 'Access-Control-Allow-Origin' $http_origin always;

2- If you got error of invalid number of arguments in "add_header" directive, then use more_set_headers:

more_set_headers -s '401 400 403 404 500' 'Access-Control-Allow-Origin: $http_origin';

NOTE: when this error happens then in $.ajax or any similar method you wont have access to status codes. So be extremely catious!!!

#nginX #web_server #CORS #more_set_headers #add_header #ajax

While configuration can be tested with command service nginx configtest, there is a more convenient way to do this - and immediately get whats wrong.

There is a command nginx -t, which test configuration and display error messages. Both commands must be used with sudo or permission denied messages might be shown (regarding SSL certificates for example).

Command to test and reload if it's ok:

sudo nginx -t && sudo service nginx reload

#nginx #test #configtest