Removed deprecated XMLHttpRequest

scripts/Application.ts

@@ -13,7 +13,6 @@ export class Application {
 	loading: HTMLElement
 	currentPath: string
 	originalPath: string
-	lastRequest: XMLHttpRequest | null
 
 	constructor() {
 		this.currentPath = window.location.pathname
@@ -35,28 +34,9 @@ export class Application {
 	}
 
 	get(url: string): Promise<string> {
-		if(this.lastRequest) {
+		return fetch(url, {
-			this.lastRequest.abort()
+			credentials: "same-origin"
-			this.lastRequest = null
+		}).then(response => response.text())
-		}
-
-		return new Promise((resolve, reject) => {
-			let request = new XMLHttpRequest()
-
-			request.onerror = () => reject(new Error("You are either offline or the requested page doesn't exist."))
-			request.ontimeout = () => reject(new Error("The page took too much time to respond."))
-			request.onload = () => {
-				if(request.status < 200 || request.status >= 400)
-					reject(request.responseText)
-				else
-					resolve(request.responseText)
-			}
-
-			request.open("GET", url, true)
-			request.send()
-
-			this.lastRequest = request
-		})
 	}
 
 	load(url: string, options?: LoadOptions) {
@@ -87,6 +67,11 @@ export class Application {
 				return
 			}
 
+			// Outdated response.
+			if(this.currentPath !== url) {
+				return
+			}
+
 			// Remove listener after we finally got the correct event.
 			this.content.removeEventListener("transitionend", onTransitionEnd)
 

sw/service-worker.ts

@@ -13,9 +13,17 @@
 // If the style or script resources changed after being served, we need
 // to force a real page reload.
 
+// Promises
 const RELOADS = new Map<string, Promise<Response>>()
-const ETAGS = new Map<string, string>()
 const CACHEREFRESH = new Map<string, Promise<void>>()
+
+// E-Tags that we served for a given URL
+const ETAGS = new Map<string, string>()
+
+// When these patterns are matched for the request URL, we exclude them from being
+// served cache-first and instead serve them via a network request.
+// Note that the service worker URL is automatically excluded from fetch events
+// and therefore doesn't need to be added here.
 const EXCLUDECACHE = new Set<string>([
 	// API requests
 	"/api/",
@@ -98,6 +106,8 @@ class MyServiceWorker {
 	onRequest(evt: FetchEvent) {
 		let request = evt.request as Request
 
+		console.log("fetch", request.url)
+
 		// If it's not a GET request, fetch it normally
 		if(request.method !== "GET") {
 			return evt.respondWith(fetch(request))
@@ -130,6 +140,10 @@ class MyServiceWorker {
 
 			CACHEREFRESH.set(request.url, cacheRefresh)
 
+			if(request.url === "/styles") {
+				console.log("/styles fetched", response.headers.get("ETag"))
+			}
+
 			return response
 		})
 
@@ -142,6 +156,11 @@ class MyServiceWorker {
 		let onResponse = response => {
 			servedETag = response.headers.get("ETag")
 			ETAGS.set(request.url, servedETag)
+
+			if(request.url === "/styles") {
+				console.log("/styles served", servedETag)
+			}
+
 			return response
 		}