Cannot SetKeepAlive() on the tcp socket created by Dial() also true when using .UnderlyingConn() and type-asserting as net.TCPConn from net.Conn or tls.Conn object #765

[andrewhodel]

UnderlyingConn().(*net.TCPConn).SetKeepAlive(bool)

This is required currently to modify the TCP keep alive for a websocket created via golang gorilla Dial().