$ python3 -m venv env

$ source env/bin/activate
$ pip install -r requirements.txt

$ flask shell
>>> from app import db
>>> db.create_all()
>>> exit()

$ flask run

$ curl --header "Content-Type: application/json" --request POST --data '{"url":"http://github.com/"}' http://localhost:5000/

$ curl --header "Content-Type: application/json" --request GET http://localhost:5000/