diff --git a/frontend/.env.example b/frontend/.env.example
index 770953d..1c6c151 100644
--- a/frontend/.env.example
+++ b/frontend/.env.example
@@ -1,7 +1,7 @@
 # API Configuration
-# Backend API base URL
+# Backend API base URL (must include /api path)
 VITE_API_URL=http://localhost:8080/api
 
 # WebSocket Configuration
-# WebSocket server URL for real-time collaboration
+# WebSocket server URL for real-time collaboration (must include /ws path)
 VITE_WS_URL=ws://localhost:8080/ws
diff --git a/frontend/src/api/client.ts b/frontend/src/api/client.ts
index f8c159d..a75e7dc 100644
--- a/frontend/src/api/client.ts
+++ b/frontend/src/api/client.ts
@@ -1,4 +1,4 @@
-const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev";
+const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev/api";
 
 export async function authFetch(url: string, options?: RequestInit): Promise<Response> {
   const token = localStorage.getItem('auth_token');
diff --git a/frontend/src/lib/yjs.ts b/frontend/src/lib/yjs.ts
index e573556..4cc6963 100644
--- a/frontend/src/lib/yjs.ts
+++ b/frontend/src/lib/yjs.ts
@@ -4,7 +4,7 @@ import { WebsocketProvider } from "y-websocket";
 import * as Y from "yjs";
 import { documentsApi } from "../api/document";
 
-const WS_URL = import.meta.env.VITE_WS_URL || "wss://docnest-backend-mingda.fly.dev";
+const WS_URL = import.meta.env.VITE_WS_URL || "wss://docnest-backend-mingda.fly.dev/ws";
 
 export interface YjsProviders {
   ydoc: Y.Doc;
diff --git a/frontend/src/pages/LoginPage.tsx b/frontend/src/pages/LoginPage.tsx
index cf5a9c3..4798309 100644
--- a/frontend/src/pages/LoginPage.tsx
+++ b/frontend/src/pages/LoginPage.tsx
@@ -3,7 +3,7 @@ import { useNavigate } from 'react-router-dom';
 import { useAuth } from '../contexts/AuthContext';
 import './LoginPage.css';
 
-const API_BASE_URL = import.meta.env.VITE_API_URL || "http://localhost:8080/api";
+const API_BASE_URL = import.meta.env.VITE_API_URL || "https://docnest-backend-mingda.fly.dev/api";
 
 function LoginPage() {
   const { user, loading } = useAuth();