Apache gzip (add this to your apache .conf or htaccess):
SetOutputFilter DEFLATE
AddOutputFilterByType DEFLATE text/plain text/html text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript application/atom+xml
Header append Vary Accept-Encoding
DeflateCompressionLevel 3
Nginx gzip (add this to your nginx .conf):
gzip on;
gzip_http_version 1.0;
gzip_vary on;
gzip_comp_level 6;
gzip_proxied any;
gzip_types text/plain text/html text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript application/javascript application/atom+xml;
gzip_buffers 16 8k;