Returns true when host is a loopback address (127.0.0.1, ::1, ::ffff:127.0.0.1, or localhost).
true
host
127.0.0.1
::1
::ffff:127.0.0.1
localhost
Returns
truewhenhostis a loopback address (127.0.0.1,::1,::ffff:127.0.0.1, orlocalhost).