Get snapshot from IP camera with Onvif protocol and send through express http response

Onvif-get-snapshot.js

function handler(req, res) {
  const {hostname, username, password} = req.body

  new Cam({
    hostname
    , username
    , password
  }, function(err){
      this.getSnapshotUri({protocol:'RTSP'}, function (err, stream){
      // Make GET request to snapshot uri from câmera
      http.get(stream.uri, {auth: `${username}:${password}`}, (httpResponse) => {
        // Array for the httpResponse buffers
        var buffers = []
        // When receive data, push to array.
        // When finished, send image to res
        httpResponse.on('data', (data) => {
          buffers.push(data)
        }).on('end', () => {
          res.contentType('image/jpeg')
          res.send(new Buffer.concat(buffers))
        })
      })
    })
  })
}