Incase any one takes place to land here (like I did) planning to add a CA (in my case Charles Proxy) for httplib2, it looks like you'll be able to append it towards the cacerts.txt file integrated Along with the python deal. @SilentGhost: you have got nailed it. I'm impressed. https://deanekpru.jiliblog.com/93983872/considerations-to-know-about-safe-haven-asset-rollover