Gets requests session.

def get_session(credentials, config):
    """Gets requests session."""
    session = requests.Session()
    session.verify = False
    auth_url = config.get("auth_url")

    if auth_url:
        cookie = session.post(
            auth_url,
            data={
                "j_username": credentials[0],
                "j_password": credentials[1],
                "submit": "Log In",
                "rememberme": "true",
            },
            headers={"Content-Type": "application/x-www-form-urlencoded"},
        )
        if not cookie:
            raise Dump2PolarionException("Cookie was not retrieved from {}.".format(auth_url))
    else:
        # TODO: can be removed once basic auth is discontinued on prod
        session.auth = credentials

    return session