Most breakage caused by new HTTP package is due to the renaming from
Response to Response_String and Request to Request_String. I think it was
not a good idea to do that. There could have well be two types named
Response from different modules, one with a type parameter and the other
one without. Or the parametrized variant could have be named
ResponseGeneric or so. That would have allowed packages to work both with
version 3001 and 4000.
