I'm having the same issue with a Pyramid web app.
Did anyone find a solution?

I've tried Flup and Waitress as the containers for the pyramid app, and 
I've tried Lighttpd and Nginx in front... no difference.  My latest 
exceptions look like:

Could not convert return value of the view callable function 
cornice.pyramidhook.handle_exceptions into a response object. The value 
returned was AttributeError("'Connection' object has no attribute 
'_Connection__connection'",).


and then on the next try


ValueError: Could not convert return value of the view callable function 
cornice.pyramidhook.handle_exceptions into a response object. The value 
returned was AssertionError('Transaction must be committed using the 
transaction manager',).



I'm using the latest of everything:

alembic0.6.0amqp1.0.13anyjson0.3.3argparse1.2.1Beaker1.6.4beautifulsoup4
4.2.1billiard2.7.3.31celery3.0.21Chameleon2.11cornice0.14coverage3.6
distribute0.7.3flup1.0.3.dev-20110405kombu2.5.12Mako0.8.1MarkupSafe0.18meld3
0.6.10mock1.0.1MySQL-python1.2.4nose1.3.0openpyxl1.6.2paramiko1.11.0
PasteDeploy1.5.0pip1.1pycrypto2.6Pygments1.6pyramid1.4.3pyramid-beaker0.8
pyramid-debugtoolbar1.0.6pyramid-mailer0.13pyramid-tm0.7Python2.7
python-dateutil2.1pytz2013brepoze.lru0.6repoze.sendmail4.1selenium2.33.0
Server0.0.6setuptools0.9.8simplejson3.3.0six1.3.0SQLAlchemy0.8.2supervisor
3.0transaction1.4.1translationstring1.1venusian1.0a8waitress0.8.5WebOb1.2.3
WebTest2.0.6wsgiref0.1.2zope.deprecation4.0.2zope.interface4.0.5
zope.sqlalchemy0.7.2


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