nginx开启gzip

	gzip on;
	gzip_min_length  5k;
	gzip_buffers     4 16k;
	#gzip_http_version 1.0;
	gzip_comp_level 3;
	gzip_types       text/plain application/x-javascript text/css application/xml text/javascript application/x-httpd-php image/jpeg image/gif image/png;
	gzip_vary on;