Comment 3 for bug 1559072

Looks like this is the breaking change in webob 1.6.0:

https://github.com/Pylons/webob/pull/139

As you can see in the response body:

RESP BODY: {"message": "The resource could not be found.<br /><br />\n\n\n", "code": "404 Not Found", "title": "Not Found"}

The error message has html in it.