feat: implement enhancedFetch for improved error handling and fallback support

lib/utils.ts

@@ -33,7 +33,7 @@ const ping =
     : async (url: string) => {
         let pingFinished = false;
         return Promise.race([
-          fetch(url, {
+          enhancedFetch(url, {
             method: 'HEAD',
           })
             .then(({ status, statusText }) => {
@@ -73,3 +73,34 @@ export const testUrls = async (urls?: string[]) => {
   logger('all ping failed, use first url:', urls[0]);
   return urls[0];
 };
+
+
+
+// export const isAndroid70AndBelow = () => {
+//   // android 7.0 and below devices do not support letsencrypt cert
+//   // https://letsencrypt.org/2023/07/10/cross-sign-expiration/
+//   return Platform.OS === 'android' && Platform.Version <= 24;
+// };
+
+export const enhancedFetch = async (
+  url: string,
+  params: Parameters<typeof fetch>[1],
+  isRetry = false,
+) => {
+  return fetch(url, params)
+    .then((r) => {
+      if (r.ok) {
+        return r;
+      }
+      throw new Error(`${r.status} ${r.statusText}`);
+    })
+    .catch((e) => {
+      logger('fetch error', url, e);
+      if (isRetry) {
+        throw e;
+      }
+      logger('trying fallback to http');
+      return enhancedFetch(url.replace('https', 'http'), params, true);
+    });
+};
+