'Socket not connected' error behind reverse proxy

[fungs]

Hi,

I observed that, when running piping-server-rust behind HAProxy, I'm getting the following error after each (successful) transfer:

[ERROR piping_server] Failed to serve HTTP connection: hyper::Error(Shutdown, Os { code: 107, kind: NotConnected, message: "Socket not connected" })
[ERROR piping_server] Failed to serve HTTP connection: hyper::Error(Shutdown, Os { code: 107, kind: NotConnected, message: "Socket not connected" })

I'm not sure what this means, and if this might be related to the timeout parameters. However, I've set timeouts generously and the reverse proxy is running on the same local system as piping-server.

Any ideas?