The World Wide Web is a major distributed system, with millions of users. A site may become a web host by running an HTTP server. While web clients are typically users with a browser, there are many other “user agents” such as web spiders, web application clients, and so on.
The Web is built on top of the HTTP (Hypertext Transfer Protocol), which is typically layered on top of a socket (e.g., TCP). HTTP has been through four publicly available versions. Version 1.1 (the third version) is the most recognized (by developers). ...
