def is_payload_in_json(content_type):
    """
    Verify the content_type.
    If "Content-Type" is NOT specified pass the payload to the "json" argument - return True.

    If "Content-Type" is specified:
        - if the value is "application/json" pass the payload to the "json" argument - return True.
        - if the value is NOT "application/json" pass the payload to the "data" argument - return False.
    :param content_type:
    :return: True or False
    """

    if not content_type:
        return True

    return "application/json" in content_type.lower()