Reverted fetch usage

scripts/Application.ts

@@ -13,6 +13,7 @@ export class Application {
 	loading: HTMLElement
 	currentPath: string
 	originalPath: string
+	lastRequest: XMLHttpRequest | null
 
 	constructor() {
 		this.currentPath = window.location.pathname
@@ -34,9 +35,32 @@ export class Application {
 	}
 
 	get(url: string): Promise<string> {
-		return fetch(url, {
-			credentials: "same-origin"
-		}).then(response => response.text())
+		// return fetch(url, {
+		// 	credentials: "same-origin"
+		// }).then(response => response.text())
+
+		if(this.lastRequest) {
+			this.lastRequest.abort()
+			this.lastRequest = null
+		}
+
+		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) {