Error for Authentication

I have followed belows steps but got error.

1. To get requst_token:
https://kite.trade/connect/login?api_key=vljy89p4oft21dnx

2. Response received:
https://software-skills.blogspot.in/2016/02/stock-picks.html?&status=success&request_token=481sa061s513v6bt72485pde8f4lotmm

3. Authentication: (Executing below request through javascript from html page - trade.html from desktop)
https://api.kite.trade/session/token?api_key=vljy89p4oft21dnx&request_token=481sa061s513v6bt72485pde8f4lotmm&checksum=36de7c28d8e592390b3778d7e52209f5e98b41ee3c5b641d12d0ade81cefa4c9

Created checksum from http://www.xorbin.com/tools/sha256-hash-calculator. SHA-256 hash of (api_key + request_token + api_secret)


trade.html:





var http = new XMLHttpRequest();
var url = "https://api.kite.trade/session/token"
var params = "api_key=vljy89p4oft21dnx&request_token=481sa061s513v6bt72485pde8f4lotmm&checksum=36de7c28d8e592390b3778d7e52209f5e98b41ee3c5b641d12d0ade81cefa4c9";
http.open("POST", url, true);
http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", params.length);
http.setRequestHeader("Connection", "close");

http.onreadystatechange = function()
{
if(http.readyState == 4 && http.status == 200)
{
alert(http.responseText);
}
}
http.send(params);







Getting error:
{"status": "error", "message": "Route not found", "error_type": "GeneralException"}


My goal is to query below url which needs access_token.
"https://api.kite.trade/instruments/NSE/INFY?api_key=xxx&access_token=yyy"

Plz help me to solve this issue.

Thanks in Advance.