Odd httpheader=1024 required for Phabricator

[Makarius]

Dear Mercurial experts,

working on Phabrictor hosting for Mercurial, I have come across an odd problem
with https URLs. In contrast to the old hg 2.8.2 of
https://admin.phacility.com more recent hg versions require a slightly odd
"httpheader=1024" for the capabilities of the command server, otherwise
Phabricator is unable to serve hosted repositories via HTTP.

See also my own ticket https://isabelle-dev.sketis.net/T8 for more details.


Can anyone shed some light on this patch and/or point to the precise hg
version where this was introduced?

[The motivation of this post is to have a better explanation of the patch that
I've found on the net, and eventually submit a well-founded request to get it
accepted by the Phabricator project.]


        Makarius