On different occasions we've seen this error when accessing a lazr.restful api (working with Apache+modwsgi+Django):
Traceback (most recent call last):
File "/usr/lib/python2.6/dist-packages/zope/publisher/publish.py", line 134, in publish
result = publication.callObject(request, obj)
File "/usr/lib/python2.6/dist-packages/lazr/restful/publisher.py", line 170, in callObject
WebServicePublicationMixin, self).callObject(request, object)
File "/usr/lib/python2.6/dist-packages/lazr/restful/simple.py", line 106, in callObject
return mapply(ob, request.getPositionalArguments(), request)
File "/usr/lib/python2.6/dist-packages/zope/publisher/publish.py", line 109, in mapply
return debug_call(obj, args)
File "/usr/lib/python2.6/dist-packages/zope/publisher/publish.py", line 115, in debug_call
return obj(*args)
ForbiddenAttribute: ('__call__', <lazr.restful._resource.CollectionResource object at 0x7f330e6ea550>)
We haven't been able to diagnose exactly what causes it. The errors are intermittent, and sometimes go away with just restarting Apache.
lazr.restful version lucid's packaged 0.9.11.
I gave some code to ISD to try and diagnose this. Until that gives us some data back, I'm going to triage this as low.