@elifarley thanks for the PR - we'll look at getting it in soon - we just want to be extra careful as we've had the opposite experience - servers rejecting host headers when there is a port set. Out of interest, what is the server that rejects it without the port?

It's an F5's BigIp proxy. But I guess it's just a matter of configuration. Our network team could probably have configured it to accept the request without a port on the Host header.