fastify.listen() behaves differently in newer version

[royalswe]

I converted our nodejs app from express to fastify and no problem until I launched it to production with Azure.

If I launch the app the depricated way like this, it will work

    const PORT = process.env.port || 8080;
    fastify.listen(PORT,'0.0.0.0', () => console.log('SERVER LISTENING AT PORT : '+ PORT))  

and the logs shows

{"level":30,"time":1706172928824,"pid":7420,"hostname":"wn0sdwk000475","msg":"Server listening at \\\\.\\pipe\\1651fab8-5938-4c38-bd0c-98bed3cdcafa"}
SERVER LISTENING AT PORT : 8080

But if I change so port and host is specified inside an object that is recommended then it will not work and it starts differently.

  const PORT = process.env.port || 8080;
  fastify.listen({port: PORT, host: '0.0.0.0'}, () => console.log('SERVER LISTENING AT PORT : '+ PORT))  

and the logs

{"level":30,"time":1706173445118,"pid":20912,"hostname":"wn0sdwk000475","msg":"Server listening at http://0.0.0.0:8080"}
SERVER LISTENING AT PORT : \\.\pipe\7fefcfa8-7a44-46e6-a584-1946acedc97c

What am I'm doing wrong with the recomended way? is it any default values that is not behaving the same way as the depricated solution?

Thanks

[royalswe]

I solved it, path instead of port

  const PORT = process.env.port || 8080;
  fastify.listen({ path: PORT, host: '0.0.0.0' }, () =>
    console.log('SERVER LISTENING AT PORT : ' + PORT)
  );