No, it still exists, though the traffic is not very high.
I assume this is because most of the detailed HTTP discussion
is so closely related to the HTTP specifications that it stays
within the HTTP-WG list.
....Roy T. Fielding Department of ICS, University of California, Irvine USA
Visiting Scholar, MIT/LCS + World-Wide Web Consortium
(fielding@w3.org) (fielding@ics.uci.edu)