Learn about HTTP headers.

We’ve talked about the layers. On the previous page, we looked at HTML, the main technology of the display layers on the Web.

Let’s put the last three pages together. We’ll track a browser’s request for a page through to the server, and see the server’s response.

We talked about the bucket o’ numbers layer. Now let’s move on the services layer. You’ll learn:

• That a service is something one computer does for another.
• How the email protocol SMTP works.
• How the Web protocol HTTP works.