diff --git a/fortune_generator/fortune.js b/fortune_generator/fortune.js
index 434a293..9b0adfb 100644
--- a/fortune_generator/fortune.js
+++ b/fortune_generator/fortune.js
@@ -1,19 +1,27 @@
 let ip = null;
-$.getJSON("https://api.ipify.org?format=json", function(data) {
-  ip = data.ip;
-})
+fetch("https://api.ipify.org?format=json").then(response => {
+  if (response.ok) {
+    return response.json();
+  }
+
+  throw new Error("Network response was not ok.");
+}).then(res => {
+  ip = res.ip;
+
+}).catch(err => {
+  if ('caches' in window) {
+    caches.match('https://api.ipify.org?format=json').then(response => {
+      if (response) {
+        return response.json();
+      }
+    }).then(data => {
+      if (ip === null && data !== undefined) {
+        ip = JSON.parse(data).ip;
+      }
+    });
+  }
+});
 
-if ('caches' in window) {
-  caches.match('https://api.ipify.org?format=json').then(response => {
-    if (response) {
-      return response.json();
-    }
-  }).then(data => {
-    if (ip === null) {
-      ip = JSON.parse(data).ip;
-    }
-  });
-}
 
 let goodFortunes = [];
 let badFortunes = [];
diff --git a/fortune_generator/service-worker.js b/fortune_generator/service-worker.js
index ef61a1b..d0afb7d 100644
--- a/fortune_generator/service-worker.js
+++ b/fortune_generator/service-worker.js
@@ -2,28 +2,28 @@ let pre_cache_file_version = 'pre-v1.0.0';
 let auto_cache_file_version = 'auto-v1.0.0'
 
 const ASSETS = [
-  'generators/images/lifeadventurer-192x192.png',
-  'generators/images/lifeadventurer-512x512.png',
-  'generators/images/lifeadventurer-180x180.png',
-  'generators/images/lifeadventurer-270x270.png',
-  'generators/images/lifeadventurer.jpg',
+  '/generators/images/lifeadventurer-192x192.png',
+  '/generators/images/lifeadventurer-512x512.png',
+  '/generators/images/lifeadventurer-180x180.png',
+  '/generators/images/lifeadventurer-270x270.png',
+  '/generators/images/lifeadventurer.jpg',
 
   'https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css',
   'https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js'
 ];
 
 const NEED_UPDATE = [
-  'generators/fortune_generator/styles.css',
-  'generators/fortune_generator/fortune.js',
-  'generators/fortune_generator/matrix.js',
-  'generators/fortune_generator/special.json',
-  'generators/fortune_generator/fortune.json',
+  '/generators/fortune_generator/',
+  '/generators/fortune_generator/index.html',
+  '/generators/fortune_generator/styles.css',
+  '/generators/fortune_generator/fortune.js',
+  '/generators/fortune_generator/matrix.js',
+  '/generators/fortune_generator/special.json',
+  '/generators/fortune_generator/fortune.json',
+  '/generators/fortune_generator/manifest.json',
+  'https://api.ipify.org/?format=json',
 ]
 
-/**
- * 
- */
-
 let limit_cache_size = (name, size) => {
   caches.open(name).then(cache => {
     cache.keys().then(key => {
@@ -34,28 +34,27 @@ let limit_cache_size = (name, size) => {
   });
 };
 
-
 let is_in_array = (str, array) => {
   let path = '';
   
-  // Check domain of request is same of current domain.
+  // Check the request's domain is the same as the current domain.
   if (str.indexOf(self.origin) === 0) {
     path = str.substring(self.origin.length); // Remove https://lifeadventurer.github.io
   } else {
     path = str; // outside request
   }
 
-  return array.indexOf(array) > -1;
+  return array.indexOf(path) > -1;
 }
 
 // install 
 self.addEventListener('install', event => {
   self.skipWaiting();
 
-  // pre cache files
+  //pre-cache files
   event.waitUntil(
     caches.open(pre_cache_file_version).then(cache => {
-      cache.addAll(ASSETS);
+      // cache.addAll(ASSETS);
     })
   );
 });
@@ -76,31 +75,26 @@ self.addEventListener('activate', event => {
 // fetch event
 self.addEventListener('fetch', event => {
   if (is_in_array(event.request.url, ASSETS)) {
-    // Cache only strategy    
+    // cache only strategy    
 
     event.respondWith(
-      caches.match(event.request)
+      caches.match(event.request.url)
     );
   } else if (is_in_array(event.request.url, NEED_UPDATE)) {
-    // Cache then network strategy
-
     event.respondWith(
-      caches.open(auto_cache_file_version).then(async cache => {
-        const res = await fetch(event.request);
-        cache.put(event.request, res.clone());
+      fetch(event.request.url).then(async response => {
+        if (response.ok) {
+          const cache = await caches.open(auto_cache_file_version);
+          cache.put(event.request.url, response.clone());
+          return response; 
+        }
 
-        return res;
+        throw new Error("Network response was not ok.");
+
+      }).catch(async error => {
+        const cache = await caches.open(auto_cache_file_version);
+        return cache.match(event.request.url);
       })
-    );
-  } else if (event.request.url.indexOf('https://api.ipify.org?format=json') > -1) {
-    fetch(event.request).then(async response => {
-      const cache = await caches.open(auto_cache_file_version);
-      cache.put(event.request.url, response.clone());
-      return response; 
-
-    }).catch(async () => {
-      const cache = await caches.open(auto_cache_file_version);
-      return await cache.match(event.request);
-    });
+    )
   }
-});
\ No newline at end of file
+});