[nginx] Mime タイプごとに expires 設定 ref: http://qiita.com/wokamoto/items/fcce196fb331057beef6

nginx.conf

map $sent_http_content_type $expires {
    default                off;
    ~image/                max;
    ~audio/                max;
    ~video/                max;
    text/css               30d;
    text/javascript        30d;
    application/javascript 30d;
    application/pdf        max;
}

server.conf

server {
 expires $expires;
 # :
}