HTTP Request with HUD

/* As of now I have made a Google Sheets with all of the Data I want to incorporate into my game... It is far from ready but I wanted to test out Google Sheets by giving myself a Beginner Starting Pack / HUD... Unfortunately I don't know where to HTTP_METHOD "GET" and "RESPONSE, the following code, aside from my Sheet URL is from what I researched in the Forums.*/

string sheetID = "18HslQMEJ76qjuPmXg9mjKpL3780_lbjhe3pfk1eeWsIE";
string sheetURL = "https://docs.google.com/spreadsheets/d/1dTWPi4uHodkcwX1qjdT1ib8M-QJbYjrPOuPaGqfpPkU/edit#gid=0";
key selfCheckRequestId;

default
{
    state_entry()
    {
    }
    touch_start(integer total_number)
    {  selfCheckRequestId =
        llHTTPRequest( sheetURL,
        [HTTP_METHOD, "GET",
        HTTP_VERBOSE_THROTTLE, FALSE,
        HTTP_BODY_MAXLENGTH, 16384],
        "");
    }
    http_response(key id, integer status, list metaData, string body)
    {
        if (id == selfCheckRequestId)
        {       string marker =  "@!@";
                integer start = llSubStringIndex(body,marker);
                integer end = llSubStringIndex(body, "</td>");
                string fetch =   llGetSubString(body,start + llStringLength(marker), end-1);
                llOwnerSay("\n response: \n" + fetch);\

        }
    }
}