Data Push Apps with HTML5 SSE: Pragmatic Solutions for by Darren Cook

By Darren Cook

Be certain your site or net software clients get content material updates straight away with minimum latency. This concise consultant indicates you the way to push new information from the server to consumers with HTML5 Server-Sent occasions (SSE), a very good expertise that doesn’t require consistent polling or person interplay. You’ll the best way to construct a real-world SSE program from begin to end that solves a hard area problem.

You’ll additionally become aware of how one can raise that application’s laptop and cellular browser aid from 60% to 99%, utilizing diversified fallback options. If you’re conversant in HTML, HTTP, and easy JavaScript, you’re able to get started.

  • Determine even if SSE, WebSockets, or information pull is healthier in your organization
  • Develop a operating SSE program whole with backend and frontend solutions
  • Address blunders dealing with, procedure restoration, and different concerns to make the appliance production-quality
  • Explore fallback options for browsers that don’t aid SSE
  • Tackle safeguard concerns, together with authorization and "disallowed origin"
  • Develop practical, repeatable info that’s precious in test-driven SSE design
  • Learn SSE protocol parts now not coated within the instance application
  • Show description

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    Extra info for Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients

    Sample text

    End(s); }); return; } //Below is to handle SSE request. It never returns. log("Flushed! log("Client closed connection. php because it is doing the tasks that Apache was taking care of in the Apache+PHP solution. Smart, Sassy Exit So that was the Hello World of the SSE world. Just a few lines on the frontend and a few lines on the backend; it couldn’t be simpler, could it? In the next five chapters we build on this knowledge to make something more sophisticated and robust that is usable on practically every desktop and mobile browser.

    N\n"; @ob_flush();@flush(); sleep(1); } Just like the frontend code, this is wonderfully short, isn’t it? No libraries, no depen‐ dencies, just a few simple lines of vanilla PHP. And just like the frontend there is more we could be doing, but again it is all optional. php, identifies this as a PHP script. Then we send back a MIME type of text/event-stream, using the header() function. text/ event-stream is the special MIME type for SSE. } is the PHP idiom for that), and in that loop we output the current timestamp every second.

    And when neither are set, it initializes from the current time, and then it outputs a line to say what seed it is using. This last point is so that if something goes wrong you have the seed to reproduce the stream of data. Once we’ve got our random seed, we call mt_srand from one of those three places. We multiply $t by 1,000; mt_srand will trun‐ cate it to an int, so this is our way of saying we care about millisecond accuracy, but not microsecond accuracy. In our main loop, the changes are simple.

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