在nginx配置文件中（/etc/nginx/nginx.conf）打开gzip

gzip on;
    gzip_buffers 32 4K;
    gzip_comp_level 6;
    gzip_min_length 100;
    gzip_types text/plain application/javascript application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png;
    gzip_disable "MSIE [1-6]\.";
    gzip_vary on;