Fixed connectivity issues

Frontend/src/api.ts

@@ -1,4 +1,5 @@
-export const API_URL = import.meta.env.VITE_API_URL || 'http://127.0.0.1:8000';
+const envUrl = import.meta.env.VITE_API_URL;
+export const API_URL = (envUrl !== undefined && envUrl !== null) ? envUrl : 'http://127.0.0.1:8000';
 
 export async function submitUrls(urls: string[]) {
   const response = await fetch(`${API_URL}/scrape`, {