Exercise 4 doesn't work because we're serving over http instead of https

[mdifl]

Following the exercise in step 4
'Uncaught TypeError: Cannot read property 'getUserMedia' of undefined'

If you're using chrome then this doesn't work because unless you've set up an ssl cert for your server setup Chrome won't allow you to request video feed. There's no reference to this error that I could find in the exercise itself. There was no reference to this potential problem in the exercise so it was very time consuming to learn what the problem was.