[server] Server kills connection while sending a file

[0xf104a]

Server kills connection even when data is written in it. So this leads to error:

ERROR|Mon, 14  Jun 2021 13:28:18 GMT:Failed to send packet: {error,{closed,<<...>>}} @ io_proxy:tcp_send/2

[0xf104a]

The problem is connected with that the Send-File rules does not notify io_proxy about that connection is still in use and as a result io_proxy just kills it after KeepAlive time.