HTTP Error 431 when pulling/pushing

[David Demelier]

On Thu, 2017-08-17 at 07:34 +0200, David Demelier wrote:
> Hello,
> 
> For the first time, I need your help. I can't figure out why today
> some
> of my repositories are unable to be pulled or pushed. I get the
> following error:
> 
> $ hg pull 
> pulling from http://hg.malikania.fr/irccd/3.0.0
> searching for changes
> abort: HTTP Error 431:
> 
> It does the same if trying to push. My webserver configuration has
> not
> changed, and nothing was updated at all.

A brand new clone works fine, it looks like there is something wrong
with my current repository. Any debug commands to see what could be the
problem?