def default_jwt_headers_callback(default_headers):
    """
    By default header typically consists of two parts: the type of the token,
    which is JWT, and the signing algorithm being used, such as HMAC SHA256
    or RSA. But we don't set the default header here we set it as empty which
    further by default set while encoding the token
    :return: default we set None here
    """
    return None
