add_url_rule

aib.py

from flask import Flask, request, jsonify

app = Flask(__name__)
app.secret_key = 'aib'

def homer():
    def home():
        return 'Ok'
    return home

app.add_url_rule('/', 'something', homer())
app.add_url_rule('/other', 'something', homer())

if __name__ == '__main__':
    with app.test_client() as c:
        print(c.get('/').data)
        print(c.get('/other').data)