Add a dedicated error code for TLS 1.3 interference.

net/tools/testserver/testserver.py

 #!/usr/bin/env python
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This is a simple HTTP/FTP/TCP/UDP/BASIC_AUTH_PROXY/WEBSOCKET server used for
 testing Chrome.
 
 It supports several test URLs, as specified by the handlers in TestPageHandler.
 By default, it listens on an ephemeral port and sends the port number back to
@@ skipping 2175 matching lines @@
                                   default=0, type=int,
                                   help='If non-zero then the generated '
                                   'certificate will have this serial number')
     self.option_parser.add_option('--tls-intolerant', dest='tls_intolerant',
                                   default='0', type='int',
                                   help='If nonzero, certain TLS connections '
                                   'will be aborted in order to test version '
                                   'fallback. 1 means all TLS versions will be '
                                   'aborted. 2 means TLS 1.1 or higher will be '
                                   'aborted. 3 means TLS 1.2 or higher will be '
+                                  'aborted. 4 means TLS 1.3 or higher will be '
                                   'aborted.')
     self.option_parser.add_option('--tls-intolerance-type',
                                   dest='tls_intolerance_type',
                                   default="alert",
                                   help='Controls how the server reacts to a '
                                   'TLS version it is intolerant to. Valid '
                                   'values are "alert", "close", and "reset".')
     self.option_parser.add_option('--signed-cert-timestamps-tls-ext',
                                   dest='signed_cert_timestamps_tls_ext',
                                   default='',
@@ skipping 90 matching lines @@
                                   'an anonymous user.')
     self.option_parser.add_option('--disable-channel-id', action='store_true')
     self.option_parser.add_option('--disable-extended-master-secret',
                                   action='store_true')
     self.option_parser.add_option('--token-binding-params', action='append',
                                   default=[], type='int')
 
 
 if __name__ == '__main__':
   sys.exit(ServerRunner().main())