Hello, if the bot is execute on same server / instance first need to check if port is free,

export const getFreePort = (): Promise<number> => {
  return new Promise((resolve, reject) => {
    const server = require('net').createServer()
    server.unref()
    server.on('error', reject)
    server.listen(() => {
      const port = server.address().port as number
      server.close(() => {
        resolve(port)
      })
    })
  })
}

const port = await getFreePort()
inventoryViewer(bot, { port })

Second if yo want to share all bots using same port (80 / 443 secured) you need made a reverse proxy with express (this part is a more bit complicated)
Need any method to map the IP/port with the proxy, In my bot is used, also i added PR to support reverse proxy =)
https://github.com/sefirosweb/minecraftLegion/blob/f6dabe72fbe5af03161d92abdd235023fff77685/server/src/routes/viewer.ts#L62C7-L77

In my bot i use socket.io to connect to the server, there is the map
bot <-> server <-> web client

Example same webserver using reverse proxy

does multiple bot support #40

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