nginx add_header not working

Question

I am having an intriguing problem where whenever I use add_header in my virtual host configuration on an ubuntu server running nginx with PHP and php-fpm it sim

Answer 1

I had the issue of not getting the response header due to the response code not within the allowed range, unless you specify the "always" keyword after the header value.

From the official docs:

Adds the specified field to a response header provided that the response code equals 200, 201, 204, 206, 301, 302, 303, 304, 307, or 308. The value can contain variables.