* `WHALESONG_HOST`: Host to listen on. Default: `localhost`
* `WHALESONG_PORT`: Port to listen on. Default: `5005`
* `WHALESONG_DATA`: The data directory where all whalesong data will be stored. Default: `~/.whalesong`
* `WHALESONG_DEBUG_ROUTES`: Set to `1` to enable certain debug routes, only use in debugging. Default: `0`