nginx_cache.conf

# put this in nginx.conf http block
proxy_cache_path /var/cache levels=1:2 keys_zone=nginx_cache:10m max_size=10g inactive=60m
use_temp_path=off;

# on vhost config put
proxy_cache nginx_cache;

# This block will catch static file requests, such as images, css, js
# The ?: prefix is a 'non-capturing' mark, meaning we do not require
# the pattern to be captured into $1 which should help improve performance
location ~* \.(?:ico|css|js|gif|jpe?g|png|woff|ttf|otf|svg|woff2|eot)$ {
    # Some basic cache-control for static files to be sent to the browser
    expires 30d; // or use max
    add_header Pragma public;
    add_header Cache-Control "public, must-revalidate, proxy-revalidate";
}