Update app.js

@@ -108,7 +108,7 @@ async function handleEvent(event) {
           'Content-Type': 'application/json',
           'Ocp-Apim-Subscription-Key': '979dc5d63344438fa4701c62feebb7dc'
         },
-        body: fs.readFileSync('image.png')
+        body: '{"url":"oss.chatbot.bu.to/photo/1.png" }'
       };
       console.log(body);
       request.post(options, function (error, response, body) {