This is a convenient hook point is subclasses want to do this differently, e.g. by farming the support-doc-fetching out to some worker processes.
Previously the delegation check was throwing a ConnectionError because it could not fetch the support document.
Conflicts: CHANGES.txt setup.py
This feature is not used by any servers in the wild, and the spec for it is going to change soon.
Add a way to configure the verification of ssl certs