Node.JS Low Level Tls HTTP Proxy Tunnel - node.js

Question

Introduction
I hope to issue raw https requests through a http proxy tunnel. I've had problems because of bad requests by which the server could not understand.
These raw https requests include first connecting to example.com in the proxy, and then posting data to it.
var http = require("http");
var tls = require("tls");
let proxyhost, proxyport;
http.request({
host: proxyhost,
port: proxyport,
method: 'CONNECT',
path: `www.example.com:443`,,
headers
}).on('connect', (res, socket) => {
if (res.statusCode === 200) {
const conn = tls.connect({
socket: socket,
rejectUnauthorized: false,
servername: 'www.example.com'
}, () => {
conn.on('data', (data) => {
console.log("chunk:", data.toString('ascii'));
})
const args = [
'CONNECT www.example.com:443 HTTP/1.1',
'Host: www.example.com:443',
'Proxy-Connection: Keep-Alive',
'',
'POST / HTTP/1.1',
'Host: www.example.com',
'accept-encoding: deflate, gzip, br',
'accept: application/json, text/javascript, */*; q=0.01',
'content-type: application/text',
'origin: https://www.example.com',
'accept-language: en-US,en;q=0.9',
'content-length: 10',
'xxxxxxxxxx' // this is supposed to be the post body
];
// conn.write("GET / HTTP/1.1\r\nconnection: keep-alive\r\nhost: www.example.com\r\n\r\n", "ascii")
conn.write(args.join("\r\n"));
});
} else {
console.log('Could not connect to proxy!');
}
}).end();