Subscribing to a topic occurs multiple times

[youfeed]

wss subscribe

message:(ws, message, isBinary)=>{
   let msg = new TextDecoder('utf-8').decode(message)
  if(msg =='subscribe'){
    ws.subscribe('uuid')
  }
})

trigger notification

.get('/*',(res, req)=>{
  app.publish('uuid', 'IsExample'+new Date())
  res.writeStatus('200 OK').writeHeader('IsExample', 'Yes').end('Hello there!');
})

result

<!--StartFragment-->
IsExampleThu Jun 02 2022 13:24:11 GMT+0800 (China Standard Time)
IsExampleThu Jun 02 2022 13:24:11 GMT+0800 (China Standard Time)
<!--EndFragment-->

I pushed it once, but the subscriber will get the second message

Did I do something wrong

[youfeed]

I found the reason, I typed in the browser /address, the browser will also send a /favicon.ico The request causes a secondary trigger