function pushDatatoServer(){
    baseURL = 'localhost'
    port = app_port
    endpoint = '/push'
    url = 'http://'+baseURL+':'+port+endpoint
    console.log(url)
    xhttp = new XMLHttpRequest()
    xhttp.open("POST",url , true);
    xhttp.setRequestHeader("Content-type", "application/json");
    xhttp.setRequestHeader("secretKey", "xSecretx");
    xhttp.onreadystatechange = function(){
        if(xhttp.readyState === 4 && xhttp.status === 200){
            var res = JSON.parse(xhttp.responseText);
            console.log(res)
            document.getElementById("final_result").innerHTML = res['riskScore'];
            //var maxval = 100;
            //var minval = 0;
            //var moreisgood = false;
            //var col = rgbify(maxval, minval, val, moreisgood)
            var score = res['riskScore'];
            if(score >= 0 && score <= 30 ){
                    var val = rgb(152,209,84);
                }
                else if (score >= 30 && score <=70){

                    var val =  rgb(253,179,74);
                }
                else  {
                    var val = rgb(255,107,107);
                }

            $("#final_result").css("background-color", val);
        }
    }
    console.log(currentState)
    xhttp.send(JSON.stringify(currentState));
 }

<div class="endspan1"  align="right">
           <input type="button" class=" button1" value="Get Score" onclick="pushDatatoServer()"  id="pushDatatoServer">
      </div>

<span  type="text" class="resultField"  id="final_result" readonly ></span