Thanks for the notice!  As far as I read from the link you cite, getting rid of the current httplib in urllib3 is planned but far from being done.  Furthermore, I don't like packages with too many 3rd party dependencies.  Since my package is working fine with the current standard lib, even though using an ugly hack in one place, I'd consider switching to urllib3 as soon as the latter makes it into the standard lib.

I still believe that adding chunked transfer encoding to http.client and urllib in the current standard lib would only require a rather small change that can easily be done such that the lib remains fully compatible with existing code.  Still waiting for feedback if such a patch is welcome.