Have you ever wondered how Drupal does what it does? Good, me too. In this series of posts, I'm going to explain what Drupal is doing behind the scenes to perform its magic.
In Part 1, we'll keep it fairly high level and walk through the path a request takes as it moves through Drupal. In later parts, we'll take deeper dives into individual pieces of this process.
Step 0: Some background information
For this example, let's pretend that George, a user of your site, wants to visit your About Us page, which lives at http://oursite/about-us.