jthomas · July 24, 2019 14:51 · Jul 24, 2019
diff --git a/worker.js b/worker.js
@@ -0,0 +1,34 @@
+const INDEX_DOCUMENT = 'index.html'
+const ERROR_DOCUMENT = '404.html'
+
+addEventListener('fetch', event => {
+  event.respondWith(handleRequest(event.request))
+})
+
+/**
+ * @param {Request} request
+ */
+async function handleRequest(request) {
+  const url = new URL(request.url)
+
+  if (url.pathname.endsWith('/')) {
+    url.pathname = `${url.pathname}${INDEX_DOCUMENT}`
+    request = new Request(url, request)
+  }
+
+  let response = await fetch(request)
+
+  if (response.status === 404) {    
+    url.pathname = ERROR_DOCUMENT
+    request = new Request(url, request)
+    response = await fetch(request)
+
+    response = new Response(response.body, {
+      status: 404,
+      statusText: 'Not Found',
+      headers: response.headers
+    })      
+  } 
+
+  return response
+}