Codeschool: Express.js, Part I

The first part of this course overlaps with the previous node.js course, and it's all a pretty gentle exposition of the express API. Some reminders:

• npm install express@4.9
• response.send() is the same as response.json() when sending arrays.
• response.redirect(301,'/parts')
• place html in /public folder (no use of ejs, yet)
• response.sendFile(__dirname + '/public/index.html');
• static middleware: app.use(express.static('public'));
• what is middleware?