Darren Cook - Data Push Apps with HTML5 SSE: Pragmatic solutions for real-world clients
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HTML5 Server Side Events (SSE) allow the server to push new data to clients, providing a superior solution to having the client poll for new data every few seconds. Presently 60% of desktop and mobile browsers support it, but this book will show how to develop fallback solutions supporting 99%. SSE offers rapid updates with low latency, and is much simpler to implement than the complementary websockets approach. For many applications, SSE will provide a cleaner implementation more rapidly.
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The modern Web is a demanding place. You have to look good. You have to load fast. And you have to have good, relevant, interesting, up-to-date content. This book is about a technology to help with the second and third of those: making sure people using your website or web application are getting content that is bang up-to-date. Minimal latency, no compromises.
This is also a book that cares about practical, real-world applications. Sure, . But the rest of the book is based around complete applications that dont shy away from the prickly echidnas that occupy the corner cases the real world will throw at us.
You need to be strong yet polite, passionate yet objective, and nice to children, the elderly, and Internet cats alike. However, this book is less demanding than real life. Im going to assume you know your HTML (HyperText Markup Language) from your HTTP (HyperText Transport Protocol), and that you also know the difference between HTML, CSS (Cascading Style Sheets), and JavaScript. To understand the client-side code you should at least be able to read and understand basic JavaScript. (When more complex JavaScript is used, it will be explained in a sidebar or appendix.)
On the server side, the book has been kept as language-neutral as possible. Most code is introduced with simple PHP code, because PHP is quite short and expressive for this kind of application. As long as you know any C-like language you will have no trouble following along, but if you get stuck, please see also shows the example in Node.js. In later chapters, if the code gets a bit PHP-specific, I also show you how to do it in some other languages.
Finally, to follow along with the examples it is assumed you have a web server such as Apache installed on your development machine. On many Linux systems it is already there, or very simple to install. For instance, on Ubuntu, sudo apt-get install lamp-server will install Apache, PHP, and MySQL in one easy step. On Windows, XAMPP is a similar all-in-one package that will give you everything you need. There is also a Mac version.
The core elements of SSE are not that complex: will give some background on HTML5, data push, potential applications, and alternative technologies.
From also spends some time developing realistic, repeatable data that our sample application can push. Though not directly about SSE, it is a very useful demonstration of designing for testability in data push applications.
, where all the security issues (cookies, authorization, CORS) that were glossed over in earlier chapters are finally covered.
The following typographical conventions are used in this book:
Indicates new terms, URLs, email addresses, filenames, and file extensions.
Constant widthUsed for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.
Constant width boldShows commands or other text that should be typed literally by the user.
Constant width italicShows text that should be replaced with user-supplied values or by values determined by context.
This element signifies a tip or suggestion.
This element signifies a general note.
This element indicates a warning or caution.
The source files used and referred to in the book are available for download at https://github.com/DarrenCook/ssebook.
This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.
We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Data Push Apps with HTML5 SSE by Darren Cook (OReilly). Copyright 2014 Darren Cook, 978-1-449-37193-7.
If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .
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SSE stands for Server-Sent Events and it is an HTML5 technology to allow the server to push fresh data to clients. It is a superior solution to having the client poll for new data every few seconds. At the time of writing it is supported natively by 65% of desktop and mobile browsers, but in this book I will show how to develop fallback solutions that allow us to support more than 99% of desktop and mobile users. By the way, 10 years ago I used Flash exclusively for this kind of data push; things have evolved such that nothing in this book uses Flash.
The browser percentages in this book come from the wonderful Can I Use website. It, in turn, gets its numbers from StatCounter GlobalStats. And, to preempt the pedants, when I say more than 99% I really mean it works on every desktop or mobile browser Ive been able to lay my hands on. Please forgive me if that doesnt turn out to be exactly 99% of your users.
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