Validating Host:Port should be checked. Possible problems are:
validateHost calls getServerName(), but serverVars['SERVER_NAME'] will not contain port number - if the server not running on port 80 or 443, it might fail
we should allow the client to add port number, even if its port 80 or 443, and don't fail
isDefaultPort should check if the request was secure or not, and report defaultness accordingly
Validating Host:Port should be checked. Possible problems are: