Heroku is a wonderful platform to host your web application which have every few traffic.
You only need to set up an
git repository and push it to
Heroku, then your web should be running!
Write your flask app and set every thing up!
Heroku seems only support
gunicorn as web server, that is what
Procfile is for.
Set up the git repository
Assuming the app your created on
Heroku is named
Every thing is done!