Axios get : response with 403 error forbidden - vue.js

Question

I'm trying to use Open API in Vue.js.
When the webpage was created, i just wanna check the fetched data on console log.
This is the error image. enter image description here
And this is Network tab. enter image description here
code
created() {
const request = require("request");
const SERVIECE_KEY =" blah blah"; // secret
let url =
"https://cors-anywhere.herokuapp.com/http://openapi.molit.go.kr:8081/OpenAPI_ToolInstallPackage/service/rest/RTMSOBJSvc/getRTMSDataSvcAptTrade";
// use 'herokuapp' as a proxy server
let queryParams =
"?" +
encodeURIComponent("serviceKey") +
`=${SERVIECE_KEY}`;
queryParams +=
"&" +
encodeURIComponent("LAWD_CD") +
"=" +
encodeURIComponent("11110");
queryParams +=
"&" +
encodeURIComponent("DEAL_YMD") +
"=" +
encodeURIComponent("201512");
request(
{
url: url + queryParams,
method: "GET",
},
function (error, response, body) {
console.log("Status", response.statusCode);
console.log("Headers", JSON.stringify(response.headers));
console.log("Reponse received", body);
}
);
},
Try
The same request works on Postman with encoded service key (no proxy server URL).
it works on a browser as well.
Use decoded and encoded service key both above the code to check if the URL i entered is wrong
I know 403 error(forbidden) is due to the permission to access.
But i really don't know what could be the problem.