The Web Service developer has implement for me a JSON response (j1.GetString2("UTF8")) with the StatusCode (ex. 200, 500, etc) and the description to display to the user.
W3.org says:
10.2 Successful 2xx
This class of status code indicates that the client's request was successfully received, understood, and accepted.
10.2.1 200 OK
The request has succeeded. The information returned with the response is dependent on the method used in the request, for example:
GET an entity corresponding to the requested resource is sent in the response;
HEAD the entity-header fields corresponding to the requested resource are sent in the response without any m-body;
POST an entity describing or containing the result of the action;
TRACE an entity containing the request message as received by the end server.