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host 

        # URI::Generic.host

(from ruby core)
---

Returns the host component of the URI.

    URI("http://foo/bar/baz").host #=> "foo"

It returns nil if no host component exists.

    URI("mailto:foo@example.org").host #=> nil

The component does not contain the port number.

    URI("http://foo:8080/bar/baz").host #=> "foo"

Since IPv6 addresses are wrapped with brackets in URIs, this method
returns IPv6 addresses wrapped with brackets. This form is not
appropriate to pass to socket methods such as TCPSocket.open. If
unwrapped host names are required, use the #hostname method.

    URI("http://[::1]/bar/baz").host     #=> "[::1]"
    URI("http://[::1]/bar/baz").hostname #=> "::1"

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