from flask import Flask
from flask import request
app = Flask(__name__)


@app.route('/')
def index():
 user_agent=request.headers.get('User_Agent')
 return 'user_agent is %s' %user_agent

if __name__ == '__main__':
 app.run(
  host='0.0.0.0',
  port= 5000,
  debug=True
 )

Serving Flask app “start” (lazy loading)
Environment: production
WARNING: Do not use the development server in a production environment.
Use a production WSGI server instead.
Debug mode: on
Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
Restarting with stat
Debugger is active!
Debugger PIN: 807-167-541