500 Internal server error with usehttp2

[Haszlakiewicz, Eric]

I'm using TortoiseHG on Windows XP:
Mercurial Distributed SCM (version 1.9+10-e9264b45237d)

And on the server:
Mercurial Distributed SCM (version 1.9)

If I set this in my mercurial.ini on windows I get 500 internal server errors when pushing:
[ui]
usehttp2=true

Even though an error happens at the end, the push appears to work fine.  I don't see any output in my Apache server's error_log.  I tried redirecting stderr and stdout in hgweb.cgi to a file (as mentioned in http://mercurial.selenic.com/bts/msg6225), but it didn't write anything and the behaviour was unchanged.

I removed the usehttp2=true from my config file, and everything is fine.

Is this a known problem?

eric