def METHOD_NAME():
    """
    Validates the incoming request
    The following are invalid
        1. The Request data is not json serializable
        2. Query Parameters are sent to the endpoint
        3. The Request Content-Type is not application/json
        4. 'X-Amz-Log-Type' header is not 'None'
        5. 'X-Amz-Invocation-Type' header is not 'RequestResponse'
    Returns
    -------
    flask.Response
        If the request is not valid a flask Response is returned
    None:
        If the request passes all validation
    """
    flask_request = request
    request_data = flask_request.get_data()
    if not request_data:
        request_data = b"{}"
    request_data = request_data.decode("utf-8")
    try:
        json.loads(request_data)
    except ValueError as json_error:
        LOG.debug("Request body was not json. Exception: %s", str(json_error))
        return LambdaErrorResponses.invalid_request_content(
            "Could not parse request body into json: No JSON object could be decoded"
        )
    if flask_request.args:
        LOG.debug("Query parameters are in the request but not supported")
        return LambdaErrorResponses.invalid_request_content("Query Parameters are not supported")
    request_headers = flask_request.headers
    log_type = request_headers.get("X-Amz-Log-Type", "None")
    if log_type != "None":
        LOG.debug("log-type: %s is not supported. None is only supported.", log_type)
        return LambdaErrorResponses.not_implemented_locally(
            "log-type: {} is not supported. None is only supported.".format(log_type)
        )
    invocation_type = request_headers.get("X-Amz-Invocation-Type", "RequestResponse")
    if invocation_type != "RequestResponse":
        LOG.warning("invocation-type: %s is not supported. RequestResponse is only supported.", invocation_type)
        return LambdaErrorResponses.not_implemented_locally(
            "invocation-type: {} is not supported. RequestResponse is only supported.".format(invocation_type)
        )
    return None