Motivation

• Prevent a panic: send on closed channel that occurred when Mux is closed while the readSession goroutine can still send new connections to newConnCh under high-frequency mixed proxy (HTTP CONNECT) traffic.

Description

• In lib/mux/mux.go update the readSession new-connection dispatch loop to return immediately when closeChan is signaled by adding case <-s.closeChan: return to the select that sends to newConnCh.
• Stop closing newConnCh in Mux.Close() to avoid send-on-closed races during shutdown and add a clarifying comment.

Testing

• No automated tests were run.