path: root/flask-without-decorator.py

from flask import Flask
app = Flask(__name__)

def say_hello():
    return "hello, world!"
app.add_url_rule("/hello", "sayhello", say_hello)  # 1st param: URL pathname, 2nd: flask's internal name of endpoint, 3rd: func to call to reply

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