Update HandshakeBuilder.java

[tasict]

The "HOST" value in standard http header can not contain port.

[MinnDevelopment]

The RFC disagrees: https://tools.ietf.org/html/rfc2616#section-14.23

Host = "Host" ":" host [ ":" port ]

[tasict]

Yes, but most browsers like Chrome, Firebox and Safari did not contain the port column. Addition port value may cause some issue in websocket work with some version haproxy

[MinnDevelopment]

I think the problem here is that you specify a default port which shouldn't be done:

The request MUST contain a |Host| header field whose value contains /host/ plus optionally ":" followed by /port/ (when not using the default port).

^{Source: https://tools.ietf.org/html/rfc6455#section-4}

And to this

but most browsers like Chrome, Firebox and Safari did not contain the port column

It doesn't make sense to make this library non-compliant with the standard because others aren't compliant. If anything the other implementation should be made standard compliant instead.

[MinnDevelopment]

It looks like firefox does use the port in the Host header when you use a non-default port:

So the correct change would be to remove the port if it's default.