url.format will return an object owns pathname rather than path, however http.request and https.request do accept path rather than pathname.

sometimes, we would seem to write our program:

var urlobj = url.format('http://github.com/yorkie');
http.request(urlobj, function (res) {
  // actually we get the response from http://github.com
});

path is missing, yeah actually we can add urlobj.path = urlobj.pathname for now, it does work as well, but it's a weird behavior in api level imo.

I'm guessing we should unify these two/three functions definitely, of course backward compatible with url module.