Fix Flask app after upgrading to Heroku’s cedar-14 stack
After upgrading my cedar stack to cedar-14 and trying to push some new code I added to hnrss, Heroku error’d out in spectacular fashion comaining about pip vendor, a bad hashlib, and a missing urllib3.
After some searching around, I finally found a solution on Stack Overflow:
After running this, I ran
git push again. It built everything from
scratch and worked like a charm.