req.host
This method is deprecated and will likely be removed or changed in an upcoming release.
#Instead, use req.hostname.
The hostname of this request, without the port number, as specified by its "Host" header.
req.host;
If this request's "Host" header was "ww3.staging.ibm.com:1492":
req.host;
// -> "ww3.staging.ibm.com"