web/notify.moe
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Added service worker explanation

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Eduard Urbach 2017-12-01 14:30:38 +01:00
parent 7a0140ca5c
commit 2a2424e61b
1 changed files with 13 additions and 0 deletions
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13
sw/service-worker.ts
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@ -1,5 +1,18 @@
// pack:ignore
// This is the service worker for notify.moe.
// When installed, it will intercept all requests made by the browser
// and return a cache-first response. By always returning cache first,
// we avoid latency problems on high latency connections like mobile
// networks. While the cache is being served, we start a real network
// request to the server to see if the resource changed. We compare the
// E-Tag of the cached and latest version of the resource. If the E-Tag
// of the current document changed, we send a message to the client
// that will cause the client to reload (diff) the page. It is not a real
// page reload as we will only calculate a DOM diff on the contents.
// If the style or script resources changed after being served, we need
// to force a real page reload.
const RELOADS = new Map<string, Promise<Response>>()
const ETAGS = new Map<string, string>()
const CACHEREFRESH = new Map<string, Promise<void>>()