server-based

A server-based authority parses according to the familiar syntax

[user-info@]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)

registry-based

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.