Watch out, cjio must use the 'develop' branch otherwise nothing will work
$ env FLASK_APP=app.py flask run
In debug mode:
$ env FLASK_APP=app.py FLASK_ENV=development flask run
http://localhost:5000/collections/delft/items/?limit=5&offset=10
http://localhost:5000/collections/delft/items/?f=json
http://localhost:5000/collections/delft/items/?bbox=1.2,44.9,55.0,1909.1