Summary:
^
Before this change, the client assumed the host and port came from location.host which is fine on the browser.
In all other cases, that object/properties may be undefined.
As such, add host and port as function args and use that instead.
Reviewed By: passy
Differential Revision: D36440423
fbshipit-source-id: 5f931f1d610d583db6a2e549e1213585f0d03dee
23b551c8bf