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 at once with minimum latency. This concise consultant indicates 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 easy methods to construct a real-world SSE software from begin to end that solves a tough area problem.

You’ll additionally realize easy methods to raise that application’s laptop and cellular browser help from 60% to 99%, utilizing various fallback options. If you’re accustomed to HTML, HTTP, and uncomplicated JavaScript, you’re able to get started.

  • Determine even if SSE, WebSockets, or information pull is better on your organization
  • Develop a operating SSE software entire with backend and frontend solutions
  • Address blunders dealing with, process restoration, and different concerns to make the applying production-quality
  • Explore fallback suggestions for browsers that don’t help SSE
  • Tackle safeguard concerns, together with authorization and "disallowed origin"
  • Develop real looking, repeatable information that’s worthy in test-driven SSE design
  • Learn SSE protocol parts now not coated within the instance application
  • Show description

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

    Sample text

    This chapter contains a bit of backend PHP code that may not feel relevant to your own application. I suggest you at least skim it, because you will see it built upon in later chapters and it shows, step-by-step, one approach for unit testing and functional testing of data push systems. Our Problem Domain The problem domain I will cover in this and the next few chapters is from the finance industry. It has its own jargon—almost as bad as the software industry—so I will in‐ troduce some of the terminology you will meet, and just enough background informa‐ tion to help you understand some of the design decisions.

    Php in the book’s source code, which uses SSE comments again to show that the artificial data is spit out at exactly the same pace as the real passage of time. html, which sets an explicit seed, and thus shows repeatable data each time you reload. "\n\n"; @ob_flush();@flush(); } Taking Stock We covered a lot of ground in this chapter. Step by step, we designed a random data backend that incorporates Design for Testability principles (while learning a little about how FX markets work), then pushed that data to clients using SSE.

    Ly/1elPD1S shows the notices PHP might throw from ob_flush(). Do infinite loops make you nervous? It is OK here. We are using up one of Apache’s threads/processes, but as soon as the browser closes the connection (whether from JavaScript, or the user closing the window) the socket is closed, and Apache will close down the PHP instance. What about caching, whether by the client or intermediate proxies, you may wonder? I agree, caching would be awfully bad for SSE: the whole point is we have new infor‐ mation we want the user to know about.

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    Data Push Apps with HTML5 SSE: Pragmatic Solutions for Real-World Clients by Darren Cook

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