HTTP is the protocol that powers the Web.

Example Request:

GET / HTTP/1.1
Host: example.org
User-Agent: Mozilla/5.0 Gecko
Accept: text/xml, image/png, image/gif, */*
Example Response:

HTTP/1.1 200 OK
Server: Apache/1.3.31 (Unix)
Content-Type: text/html
Content-Length: 57
Connection: close

<html>
<p>Here is the resource you requested.</p>
</html>