Download e-book for iPad: Data Push Apps with HTML5 SSE: Pragmatic Solutions for by Darren Cook

By Darren Cook

ISBN-10: 1449371884

ISBN-13: 9781449371883

Verify your site or internet software clients get content material updates immediately with minimum latency. This concise advisor exhibits you the way to push new info from the server to consumers with HTML5 Server-Sent occasions (SSE), a superb know-how that doesn’t require consistent polling or person interplay. You’ll how you can construct a real-world SSE program from begin to end that solves a hard area problem.

You’ll additionally observe how one can raise that application’s computing device and cellular browser help from 60% to 99%, utilizing diversified fallback options. If you’re accustomed to HTML, HTTP, and uncomplicated JavaScript, you’re able to get started.

  • Determine no matter if SSE, WebSockets, or facts pull is healthier on your organization
  • Develop a operating SSE software whole with backend and frontend solutions
  • Address errors dealing with, method restoration, and different matters to make the applying production-quality
  • Explore fallback suggestions for browsers that don’t aid SSE
  • Tackle protection matters, together with authorization and "disallowed origin"
  • Develop reasonable, repeatable info that’s worthy in test-driven SSE design
  • Learn SSE protocol parts now not lined within the instance application
  • Show description

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    Additional resources for Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients

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    And it was us who put it there earlier. I am talking about the way we pass $t to generate(), rather than having generate() call microtime(true) itself. 0;. 31113"} And it is that exact same line every time you run the script, regardless of the CPU, load, or insect behavior. Obviously we do not want it to be February 13, 2009 forever. php, the main change is the block of code just before the main loop. But, in fact, the code is quite mundane. ), it gets the seed from the first command-line parameter; if run from a web server, it looks for input4 called seed and uses that ($_REQUEST['seed'];).

    We need to do this for more than one currency pair. • We have to do it with minimal latency (sudden movements and stale prices will cost our traders money). • Our application will be running for 120 hours in a row, then will have nothing to do for 48 hours, before the cycle repeats. The Backend The backend demonstrated in this chapter is more complicated than the one shown in Chapter 2. We want multiple data feeds (aka symbols); call it multiplexing when you need to impress your boss. We want it to be used for repeatable tests, we want realisticlooking data, and we want it to be in sync for each client that connects.

    The “data:” prefix and the “\n\n” suffix are the SSE protocol. toISO String() is the JavaScript idiom to get the current timestamp. js. Don’t try to test it in a browser just yet (it won’t work). 1:1234/. 142Z ... Some Improvements There are a couple of ways we can enhance the script, though they get away from this chapter’s theme of minimal. argv[2] || 1234 ); Then change the final line of the script so it looks like this: ... listen(port); This allows you to specify the port to listen to, on the command line.

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