title: Differences between webhook and websocket?
body: <p>I've always wanted to do a real-time chat.</p>
  <p>I've done that years ago in PHP+Ajax+Mysql and broke my server.</p>
  <p>Then I tried with Flash+ a text file. I gave up and haven't tried in 10 years. But recently I heard about webhooks and websockets.</p>
  <p>And they both seem to be a way to do that but I don't really quite grasp the difference.</p>
  <p>Anyone can explain?</p>
  <p>Thanks!</p>