Every so often, Arborwiki's web server gets wedged, with errors like
[Sat Oct 13 21:27:47 2012] [error] [client 18.104.22.168] Premature end of script headers: localwiki.wsgi
in the log files. I've got monitoring set up to notice when this happens, but so far this has been a stumper. Apologies for the occasional downtime.
I'm now monitoring with monit which if it's working correctly should automatically restart the server if it's wedged. Of course I can't yet force it to get wedged reliably, so this might take days to properly test. Still it does notice that it's currently working and tests it every so often to make sure that it does.
The open issue on Github is here, if you care to read the gory details.