export AUTHLIB_INSECURETRANSPORT=1
NOTE: the comment in README says to "Set Flask and Authlib environment variables:" but only provides one command show in #6._
flask initdb
The output from #7 is as follows:
Usage: flask [OPTIONS] COMMAND [ARGS]...
Try "flask --help" for help.
Error: No such command "initdb".
To recreate on Linux Mint 18:
The output from #7 is as follows: