refactor: switch from Fetch API to Axios (#1520)

* refactor: switch from Fetch API to Axios

* fix: remove unwanted changes

* fix: rewrite error handling for Axios and remove IPv4 first setting

* style: run prettier

* style: run prettier

* fix: add back custom proxy agent

* fix: add back custom proxy agent

* fix: correct rebase issue

* fix: resolve review comments

server/utils/customProxyAgent.ts

@@ -1,5 +1,6 @@
 import type { ProxySettings } from '@server/lib/settings';
 import logger from '@server/logger';
+import axios from 'axios';
 import type { Dispatcher } from 'undici';
 import { Agent, ProxyAgent, setGlobalDispatcher } from 'undici';
 
@@ -73,15 +74,8 @@ export default async function createCustomProxyAgent(
   }
 
   try {
-    const res = await fetch('https://www.google.com', { method: 'HEAD' });
-    if (res.ok) {
-      logger.debug('HTTP(S) proxy connected successfully', { label: 'Proxy' });
-    } else {
-      logger.error('Proxy responded, but with a non-OK status: ' + res.status, {
-        label: 'Proxy',
-      });
-      setGlobalDispatcher(defaultAgent);
-    }
+    await axios.head('https://www.google.com');
+    logger.debug('HTTP(S) proxy connected successfully', { label: 'Proxy' });
   } catch (e) {
     logger.error(
       'Failed to connect to the proxy: ' + e.message + ': ' + e.cause,