Authority specification

The authority, as we already specified, can be broken down as follows:

//[access_credentials][@]host_domain[:port]

So, if an authority component is present, it will always be prefixed with a (//) delimiter, and will always contain the host domain. Meanwhile, the access credentials component is also broken down as follows:

[user_id][:][password]

Here, only one component is required. However, if either component is present, then the (@) character separating access credentials from the host domain becomes a requirement. And, if both the user_id and the password functions are present, then the colon (:) delimiter between the two components will be required.