URI - Authority (User /Host / Port )

This page is about the authority part of an URI ¹⁾

The authority component of a hierarchical URI is, if specified, either:

• server-based
• or registry-based.

A server-based authority parses according to the familiar syntax

[[email protected]]host[:port] 

where:

• the characters @ and : stand for themselves.
• user-info is optional and defines the credential (or the scope)
• host and port defines a endpoint (host)

Nearly all URI schemes currently in use are server-based. An authority component that does not parse in this way is considered to be registry-based.