Update app.js

app.js

@@ -74,7 +74,7 @@ app.get('/', (req, res) => {
   res.status(200).send('Vertex Claude API From GCP');
 });
 
-app.post('/ai/v1/chat/completions', async (req, res) => {
+app.post('/ai/v1/messages', async (req, res) => {
   const apiKey = req.headers['x-api-key'];
   if (apiKey !== API_KEY) {
     return res.status(403).json({