Previously, OperationRequestFactory would add a Host header if one did
not already exist in the request’s headers, however it did not include
the port. This meant that when the request was being made to a
non-standard port (a port other than 80 for an HTTP request and 443 for
an HTTPS request) the Host header was incorrect.
This commit updates OperationRequestFactory to check the URI for a port
and, if it has one, include it in the Host header.
UriModifyingOperationPreprocessor has also been updated to correctly
include the port in the Host header.
Closes gh-269
a4298b29e7