November 2012
Intermediate to advanced
500 pages
11h 21m
English
Content preview from HTML5 HacksBecome 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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Chapter 9. Hacking HTML5 Connectivity
The HTML5 connectivity layer is made up of perhaps the most exciting of the specifications in the HTML5 family. In this group are XHR2, the WebSocket Protocol, the Server-Sent Events feature and EventSource JavaScript API, and SPDY. Many would agree these technologies are already disrupting web application design in much the same way Ajax did in the mid-2000s.
These technologies and protocols make up the next evolution in client/server web technology.
The WebSocket Protocol creates a single, persistent TCP socket connection between a client and a server, allowing for bidirectional, full-duplex messages to be distributed without the overhead of HTTP headers and cookies. This long-awaited technology provides a solution that was formerly created through creative uses of HTTP.
Over the past decade, web application developers have crafted
technologies and techniques such as Ajax, Comet, Flash sockets, HTTP
streaming, BOSH, and Reverse HTTP to achieve solutions that provided
real-time UI updates. In the section Polyfill WebSocket Support with Socket.IO and in [Hack #76], we will rehash some
of those techniques as we set up a Node.js socket server that provides
fallbacks for browsers that have yet to implement the WebSocket
specification. While we are at it, we will also inspect the network and peer
deeper into the connectivity layer by exploring the command-line interface
of the ws module for Node.js in [Hack #71], and by using the Chrome Developer Tools ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.