On client CloseWrite, do CloseWrite instead of Close for backend

Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>

pkg/tcp/tls.go

@@ -2,7 +2,6 @@ package tcp
 
 import (
 	"crypto/tls"
-	"net"
 )
 
 // TLSHandler handles TLS connections
@@ -12,6 +11,6 @@ type TLSHandler struct {
 }
 
 // ServeTCP terminates the TLS connection
-func (t *TLSHandler) ServeTCP(conn net.Conn) {
+func (t *TLSHandler) ServeTCP(conn WriteCloser) {
 	t.Next.ServeTCP(tls.Server(conn, t.Config))
 }