Gunicorn and Flask blueprints

Question

I'm using Gunicorn (on nginx) with Flask. Let's say I have two Python files, linked with a Flask Blueprint: app.py and api.py where api.py has the url prefix /api . Why is it that any routes in app.py work although all Blueprinted (ie /api ) routes return 404s?

app.py looks something like this:

from flask import Flask, Blueprint
app = Flask(__name__)
@app.route('/')
def index():
    return '''cheese-bread'''

if __name__ == '__main__':
    app.register_blueprint(api, url_prefix='/api')
    app.run(host='0.0.0.0')

and api.py

from flask import Blueprint, jsonify
api = Blueprint('/api', __name__)
@api.route('/')
def index():
    return jsonify({'bread' : 'cheese, please'})

wsgi.py is as simple as possible

from app import app

if __name__ == "__main__":
     app.run()

Startup scripts are not relevant as the 404s appear when running for development with gunicorn -b 0.0.0.0:8000 wsgi:app

Any help would be greatly appreciated.

Answer 1

you need to register the blueprint outside of if __name__ == "__main__" , since when you say from app import app it will not run any code in the guardblock

from flask import Flask, Blueprint
app = Flask(__name__)
@app.route('/')
def index():
    return '''cheese-bread'''
app.register_blueprint(api, url_prefix='/api')
if __name__ == '__main__':

    app.run(host='0.0.0.0')

that way when you import it in wsgi it also has the blueprint registered ...

alternatively you could register the blueprint in the wsgi.py