December 2014
Intermediate to advanced
274 pages
6h 8m
English
Content preview from Programming Chrome AppsBecome 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 4. Networking and Messaging
This chapter is mostly concerned with communication between Chrome App clients and servers on the Internet, using both APIs unique to Chrome Apps and APIs that are part of HTML5, such as WebSockets. I also discuss communication between windows in the same app as well as between apps on the same computer. We also explore notifications that an app can pop up at the top of the screen to alert the user.
The first section, which looks at the Socket API, is highly technical and perhaps not of interest to many readers, but it’s one of the most important Chrome APIs, so I cover it in detail. However, if you want to go directly to the APIs you’re likely to actually use, you can skip that section and start with The XMLHttpRequest API.
Socket API
The Internet communicates by using TCP/IP, the initials of its two most important protocols: Transmission Control Protocol and Internet Protocol. These were developed from research sponsored by the United States government that began in the 1960s. The TCP/IP standard was eventually adopted by the Department of Defense in 1982. A year or so later, an API implementing TCP/IP was released by the University of California in version 4.2BSD (Berkeley Software Distribution) of Unix, and that API came to be called BSD Sockets.
It’s not much of an exaggeration to call BSD Sockets the API of the Internet. Nearly all web servers, browsers, email systems, FTP clients and servers, and everything else that talks to the Internet is ...
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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.