9. WebSockets

The Hypertext Transfer Protocol (HTTP) is just great. Together with FTP, SMTP, IMAP, and many others, it is part of the large family of text-based protocols executed in the TCP/IP Application Layer. In these protocols, client and server communicate via messages in text form. The following listing demonstrates how easy it is to “speak” HTTP with a web server:

user@host:~> telnet www.google.com 80Trying to www.l.google.com.Escape character is '^]'.GET /search?q=html5 HTTP/1.0

To run a Google search for the term html5, we first connect to www.google.com on the port reserved for HTTP, port 80. The request has three parts: In the first part GET determines the method for the request; in this case we want to ...

Get HTML5 Guidelines for Web Developers now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.