How to resolve Status: 400 error with Nodejs - node.js

Question

I am getting Status 400 error with below Nodejs code
This is trying to send https post request to abc.xyz on port 12345
I am unable to figure what is wrong here.
Although I am not Nodejs expert
const https = require('https');
const options = {
hostname: 'abc.xyz',
port: 12345,
path: '/test/',
method: 'POST',
json: true,
rejectUnauthorized: false
};
exports.handler = (event, context, callback) => {
const req = https.request(options, (res) => {
let body = '';
console.log('Status:', res.statusCode);
console.log('Headers:', JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', (chunk) => body += chunk);
res.on('end', () => {
console.log('Successfully processed HTTPS response');
// If we know it's JSON, parse it
if (res.headers['content-type'] === 'application/json') {
body = JSON.parse(body);
// console.log('Body: ' + body);
}
callback(null, body);
});
});
req.on('error', callback);
// req.write(JSON.stringify(event.data));
//console.log(event.data);
req.end();
};

Answer 1

You can only host these applications on localhost when testing.
You also need an app.listen(LOCALHOST:PORT);
A simple Nodejs tutorial will give you a deeper explanation.
This is a simple node server running on localhost 8080, no one else can see it.
var http = require('http');
//create a server object:
http.createServer(function (req, res) {
res.write('Hello World!'); //write a response to the client
res.end(); //end the response
}).listen(8080); //the server object listens on port 8080