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JavaScript

var https = require('https');
var excel = require('exceljs');
var fs = require('fs');
var querystring = require('querystring');

const post_data = querystring.stringify({
	'username': 'user',
	'password': 'passwd'
});

const auth_opt = {
	hostname: 'mysite.ru',
	port: 443,
	path: '/logon',
	method: 'POST',
	headers: {
		'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
		'Content-Length': Buffer.byteLength(post_data)
	}
};

const logon = https.request(auth_opt, (res) => {
	res.on('data', (d) => {
		console.log('There is a message: ' + d);
	});
});

logon.on('error', (e) => {
	console.log('Something went wrong with logon: ' + e);
});	

logon.write(post_data);
logon.end();