Currently, http-socket uses a `parse_url` method which only works correctly with IPv4 hosts (e.g. `http://192.168.1.1:3000`). When using an IPv6 host (e.g. `http://[abcd::1]:3000`), the port number is not parsed due to a pointer increment error, which leads to the algorithm assuming a default port of 80 even when the user code has specified otherwise. This fix provides full URL parsing for IPv6 hosts, and does not break IPv4 functionality.
