Getting LTP values like Margins

trying to get this using javascript but getting CORS Error

cross-origin resource sharing error preflightmissingalloworiginheader

$.ajax({
url: "https://api.kite.trade/quote/ltp?i=NSE:INFY",
type: 'GET',
dataType: 'json',
cors: true,
contentType: 'application/json',
secure: true,
headers: {
'Access-Control-Allow-Origin': '*',
},
beforeSend: function (xhr) {
xhr.setRequestHeader("Authorization", "token api:token");
},
success: function (data) {
alert(data);
}
})

i am able to get margins (https://api.kite.trade/margins/basket?consider_positions=false) with API AND TOKEN

can i get LTP ("https://api.kite.trade/quote/ltp?i=NSE:INFY") with API AND TOKEN

If yes
below is the code not working am i missing something

var url = "https://api.kite.trade/quote/ltp?i=NSE:INFY";
var httpRequest = (HttpWebRequest)WebRequest.Create(url);
httpRequest.Method = "POST";

httpRequest.Headers["Authorization"] = "token " + api + ":" + accesstoken;
httpRequest.ContentType = "application/x-www-form-urlencoded";

//var data = "['NSE:INFY', 'BSE:INFY']"; //
//using (var streamWriter = new StreamWriter(httpRequest.GetRequestStream()))
//{
// streamWriter.Write(data);
//}


var httpResponse = (HttpWebResponse)httpRequest.GetResponse();
string result;
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
json = JsonConvert.DeserializeObject(result);

return result;

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