string URL = "http://gridurl.appspot.com/go/e0a86ba9-99d8-4aa7-80b9-b04d42e2fec7";

key request;

default
{
    touch_start(integer total_number)
    {
        string json = llList2Json(JSON_ARRAY,["this is the message from the client to the server"]);
        request = llHTTPRequest(URL,[HTTP_METHOD,"POST",
                    HTTP_MIMETYPE,"application/json",
                    HTTP_VERBOSE_THROTTLE,FALSE],
                    json);
    }
    http_response(key q,integer status,list meta,string body) {
        if (q == request) {
            if (status != 200) {
                llOwnerSay("Connection failure");
                return;
            }
            llOwnerSay("RESPONSE: "+body);
        }
    }
}