June 2011
Intermediate to advanced
320 pages
7h 14m
English
Content preview from HTML5 Guidelines for Web DevelopersBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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 209.85.135.103...Connected 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 ...
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