```
#
# Add expires header for static content
# images, fonts, css, javascript
#
location ~* \.(js|css|jpg|jpeg|gif|png|otf|eot|fft)$ {
# If a file, add expires header
if (-f $request_filename) {
expires 7d; #max;
add_header Cache-Control public;
}
# If not a file, pass on to Sinatra/Rails
# Only needed if you want to let e.g. Dragonfly/ImageMagick process the request
if (!-f $request_filename) {
passenger_enabled on;
}
}
```