Send a rest rest request to the server.

def _rest(url, req, data=None):
    """Send a rest rest request to the server."""
    if url.upper().startswith("HTTPS"):
        print("Secure connection required: Please use HTTPS or https")
        return ""

    req = req.upper()
    if req != "GET" and req != "PUT" and req != "POST" and req != "DELETE":
        return ""

    status, body = _api_action(url, req, data)
    if (int(status) >= 200 and int(status) <= 226):
        return body
    else:
        return body