开启gzip压缩

server{        listen 80;        server_name www.example.com; #server_name end        gzip on;        gzip_min_length 1;   #最小压缩页面为1字节        gzip_buffers 4 16k;  #压缩的缓存        gzip_comp_level 2;   #压缩级别，越高压缩比越高，但占用资源也越高        gzip_disable "MSIE [1-6].";   #对低版本IE不启用压缩        gzip_types text/plain application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png application/json application/javascript application/x-font-ttf;    #进行gzip压缩的文件类型        gzip_vary off;   #不加vary头        location ~ ^/wechat {#以下省略