test: validate native TLS on Linux

transport/native/server.go

@@ -614,6 +614,10 @@ func readRequest(reader *bufio.Reader, conn net.Conn, maxHeaderBytes int, maxBod
 		RemoteAddr:    conn.RemoteAddr().String(),
 		Trailer:       trailer,
 	}
+	if tlsConn, ok := conn.(*tls.Conn); ok {
+		state := tlsConn.ConnectionState()
+		request.TLS = &state
+	}
 	if chunked {
 		request.TransferEncoding = []string{"chunked"}
 	}