[FIXED] How to solve 403 error with Flask in Python?

Issue

I made a simple server using python flask in mac. Please find below the code.

from flask import Flask

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def hello():
    print("request received")
    return "Hello world!"

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

I run it using python3 main.py command.

While calling above API on url http://localhost:5000/ from Postman using GET / POST method, it always returns http 403 error.

Python version : 3.8.9

OS : Mac OS 12.4

Flask : 2.1.2

Solution

Mac OSX Monterey (12.x) currently uses ports 5000 and 7000 for its Control centre hence the issue.

Try running your app from port other than 5000 and 7000

use this:

if __name__ == "__main__":
    app.run(port=8000, debug=True)

You can also turn off AirPlay Receiver in the Sharing via System Preference.

Related discussion here: https://developer.apple.com/forums/thread/682332

Answered By - ShivaGaire