make https server using expressjs v4

https-server-bin-www.js

#!/usr/bin/env node

/**
 * Module dependencies.
 */

var app = require('../app');

var debug = require('debug')('logstash_test:server');
var http = require('http');
var https = require('https');
var fs = require('fs');

/**
 * Get port from environment and store in Express.
 */

var http_port = 3000;

var port = normalizePort(process.env.PORT || http_port);
app.set('port', port);

/**
 * Create HTTP server.
 */

var http_server = http.createServer(app);

http_server.listen(port);
http_server.on('error', onError);
http_server.on('listening', onListening);



/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  var bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = http_server.address();
  var bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'port ' + addr.port;
  debug('Listening on ' + bind);
}

/*https server settings start*/
/*
 * Create HTTPS options server.
 * */
var options = {
    key: fs.readFileSync(__dirname + '/../keyfiles/key.pem'),
    cert: fs.readFileSync(__dirname + '/../keyfiles/cert.pem')
};

var app2 = require('../app');
var https_port = 443;
var port2 = normalizePort(process.env.PORT || https_port);
app2.set('port', port2);
var https_server = https.createServer(options, app2);
https_server.listen(port2);

//https server added

I need to understand how to Switch case works for Port pipe error. Suppose I set the port as '5J00k" it gets into the 'EADDRINUSE'. It always goes to the ADDRESS IN USE case although it is not in use.