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AN INTRODUCTION TO SERVICE WORKERS
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Phil Nash @philnash http://philna.sh philnash@twilio.com
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AN INTRODUCTION TO SERVICE WORKERS
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SERVICE WORKERS ARE SCRIPTS THAT INTERCEPT NETWORK REQUESTS
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SO WEB DEVELOPERS CAN TREAT THE NETWORK AS AN ENHANCEMENT
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AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS
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A SLIGHTLY LONGER INTRODUCTION TO SERVICE WORKERS
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XMLHttpRequest
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IN THE FUTURE WE WILL WONDER HOW WE COPED WITHOUT SERVICE WORKERS
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THE BIRTH OF THE SERVICE WORKER
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The Application Cache CACHE MANIFEST # Version 7 CACHE: # Stylesheets /style/app.css # JavaScripts /js/app.js 01. 02. 03. 04. 05. 06. 07. 08.
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“THE APPLICATION CACHE IS A DOUCHEBAG”
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The Spec https://slightlyoff.github.io/ServiceWorker/spec/service_worker/
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Browsers 40 27 44 4
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The other browsers? preview under consideration
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SO WHAT DOES IT REALLY DO?
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Install it navigator.serviceWorker.register("/sw.js");
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Install it navigator.serviceWorker.register("/sw.js", { scope: "/admin" }); 01. 02. 03.
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Install it navigator.serviceWorker.register("/sw.js").then(function(){ console.log(" "); }).catch(function(){ console.log(" "); }); 01. 02. 03. 04. 05.
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It intercepts network requests // sw.js self.addEventListener("fetch", function(event) { // do something }); 01. 02. 03. 04.
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IT'S A PROXY THAT YOU CONTROL
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SECURITY?
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HTTPS
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LOCALHOST
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DEMO
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WHY?
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WEB VS NATIVE
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Native Web Online by default Offline by default Discoverable on the web App store installation
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Native Web Offline first Offline by default Discoverable on the web App store installation
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DON'T CARE FOR OFFLINE?
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PERFORMANCE
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FALLBACKS
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PUSH NOTIFICATIONS
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DEMO
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Browsers 42 44 37 4
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WITH GREAT POWER…
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BACKGROUND SYNC
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DEMO
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Browsers 49
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GEOFENCING
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MAYBE...?
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PROGRESSIVE WEB APPS
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Progressive Web Apps • Service Worker (+ HTTPS) • manifest.json • User engagement
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APP INSTALL BANNERS
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ICON ON HOMESCREEN
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...
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$$ PROFIT! $$
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SERVICE WORKERS
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ENHANCEMENT
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AN INTRODUCTION TO SERVICE WORKERS
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SERVICE WORKERS ARE SCRIPTS THAT INTERCEPT NETWORK REQUESTS
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SO WEB DEVELOPERS CAN TREAT THE NETWORK AS AN ENHANCEMENT
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AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS
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AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS
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AND PROVIDE BETTER EXPERIENCES FOR USERS OF WEB APPLICATIONS
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IN THE FUTURE WE WILL WONDER HOW WE COPED WITHOUT SERVICE WORKERS
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AND IF YOU'RE NOT YET CONVINCED...
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THANKS!
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Thanks! @philnash http://philna.sh philnash@twilio.com