Use x-forwarded-for for websockets clients

[mkl262]

Hi,

My ejabberd server sits behind an AWS ALB, which passes the x-forwarded-for http headers.
When a client connects using WebSocket, its source IP in ejabberdctl connected_users_info shows the IP address of the ALB in the subnet.

I would like that the x-forwarded-for header which is included in the http upgrade request, which is sent to initiate the WebSocket connection, will be used as the source IP of the client.

As a workaround in my test environment I used HAProxy with proxy protocol, and it showed the true client IP in ejabberd.

Thanks.