text: #!/usr/bin/env node
  
  /**
   * Module dependencies.
   */
  const dotenv = require("dotenv").config();
  const app = require("../app.js");
  const debug = require("debug")("tut-2:server");
  const http = require("http");
  
  /**
   * Get port from environment and store in Express.
   */
  
  const port = normalizePort(process.env.PORT || "3000");
  app.set("port", port);
  
  /**
   * Create HTTP server.
   */
  
  const server = http.createServer(app);
  
  /**
   * Listen on provided port, on all network interfaces.
   */
  
  server.listen(port);
  server.on("error", onError);
  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) {
      console.log("on Error of the www bin");
  
      if (error.syscall !== "listen") {
          throw error;
      }
  
      const 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() {
      console.log("Server is listening on port ", port);
      const addr = server.address();
      const bind =
          typeof addr === "string" ? "pipe " + addr : "port " + addr.port;
      debug("Listening on " + bind);
  }
  