How to check which directive actually delivers the files?

[atulhost]

To server static files from nginx use the below configs inside serverblock
of nginx,

location ~* \.(js|css|png|jpg|jpeg|gif|ico|eot|otf|ttf|woff)$ {
access_log off; log_not_found off; expires 30d;
}

and use symbol "|" without quote and extension name to add more static file
or extension types.

Source:
http://atulhost.com/install-wordpress-on-nginx-with-fastcgi-cache-in-ubuntu

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,264129,264206#msg-264206