There is more than one way of representing IP addresses (both v4 and v6). For example, 127.0.0.1 is the same as 127.1!

If you require gzip compression on responses with types other than text/html, and you're running Nginx, you have to turn it on explicitly. To do so, you can add something like the following to a virtual host configuration file (usually located in /etc/nginx/sites-enabled), inside the server block:

A 304 response from a web server means that the browser can use its cached version of the response to the request that was sent.