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Rubyビルドパックさん警告してくれるんだけど無視しても動いてるのなんでやろな

###### WARNING:

You set `config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect'` in production,
but you do not have `nginx` installed on this app. This setting will cause any assets
being served by your application to be returned without a body.

To fix this issue, please set:

```
config.action_dispatch.x_sendfile_header = nil
```