Use **request.args.get(param)** :

http://10.1.1.1:5000/login?username=alex&password=pw1

 @app.route('/login', methods=['GET', 'POST'])
 def login():
 username = request.args.get('username')
 print(username)
 password = request.args.get('password')
 print(password)

# Below is the ref link:
[enter link description here][1]


 [1]: https://flask.palletsprojects.com/en/1.1.x/api/#flask.Request.args