How can you programmatically obtain a token from a client?

To programmatically obtain a token from a client in Python (for example, in a web application), the token is usually transmitted in the HTTP request — in headers, URL parameters, or the request body.

Example of obtaining a token from the Authorization header in Flask:

from flask import request

def get_token():
    auth_header = request.headers.get('Authorization')
    if auth_header and auth_header.startswith('Bearer '):
        token = auth_header[len('Bearer '):]
        return token
    return None

If the token is transmitted via cookie or request parameters, they can be accessed through request.cookies or request.args respectively.