old_contents: # Copyright 2011, Google Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     * Redistributions of source code must retain the above copyright
  # notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above
  # copyright notice, this list of conditions and the following disclaimer
  # in the documentation and/or other materials provided with the
  # distribution.
  #     * Neither the name of Google Inc. nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  
  # Constants indicating WebSocket protocol version.
  VERSION_HYBI07 = 7
  VERSION_HYBI00 = 0
  VERSION_HIXIE75 = -1
  
  # Port numbers
  DEFAULT_WEB_SOCKET_PORT = 80
  DEFAULT_WEB_SOCKET_SECURE_PORT = 443
  
  # Schemes
  WEB_SOCKET_SCHEME = 'ws'
  WEB_SOCKET_SECURE_SCHEME = 'wss'
  
  # Frame opcodes defined in the spec.
  OPCODE_CONTINUATION = 0x0
  OPCODE_TEXT = 0x1
  OPCODE_BINARY = 0x2
  OPCODE_CLOSE = 0x8
  OPCODE_PING = 0x9
  OPCODE_PONG = 0xa
  
  # UUIDs used by HyBi 07 opening handshake and frame masking.
  WEBSOCKET_ACCEPT_UUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
  
  # Opening handshake header names and expected values.
  UPGRADE_HEADER = 'Upgrade'
  WEBSOCKET_UPGRADE_TYPE = 'websocket'
  WEBSOCKET_UPGRADE_TYPE_HIXIE75 = 'WebSocket'
  CONNECTION_HEADER = 'Connection'
  UPGRADE_CONNECTION_TYPE = 'Upgrade'
  HOST_HEADER = 'Host'
  SEC_WEBSOCKET_ORIGIN_HEADER = 'Sec-WebSocket-Origin'
  SEC_WEBSOCKET_KEY_HEADER = 'Sec-WebSocket-Key'
  SEC_WEBSOCKET_ACCEPT_HEADER = 'Sec-WebSocket-Accept'
  SEC_WEBSOCKET_VERSION_HEADER = 'Sec-WebSocket-Version'
  SEC_WEBSOCKET_PROTOCOL_HEADER = 'Sec-WebSocket-Protocol'
  SEC_WEBSOCKET_EXTENSIONS_HEADER = 'Sec-WebSocket-Extensions'
  
  # Status codes
  STATUS_NORMAL = 1000
  STATUS_GOING_AWAY = 1001
  STATUS_PROTOCOL_ERROR = 1002
  STATUS_UNSUPPORTED = 1003
  STATUS_TOO_LARGE = 1004
  
new_contents: # Copyright 2011, Google Inc.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are
  # met:
  #
  #     * Redistributions of source code must retain the above copyright
  # notice, this list of conditions and the following disclaimer.
  #     * Redistributions in binary form must reproduce the above
  # copyright notice, this list of conditions and the following disclaimer
  # in the documentation and/or other materials provided with the
  # distribution.
  #     * Neither the name of Google Inc. nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  
  # Constants indicating WebSocket protocol version.
  VERSION_HYBI07 = 7
  VERSION_HYBI00 = 0
  VERSION_HIXIE75 = -1
  
  # Port numbers
  DEFAULT_WEB_SOCKET_PORT = 80
  DEFAULT_WEB_SOCKET_SECURE_PORT = 443
  
  # Schemes
  WEB_SOCKET_SCHEME = 'ws'
  WEB_SOCKET_SECURE_SCHEME = 'wss'
  
  # Frame opcodes defined in the spec.
  OPCODE_CONTINUATION = 0x0
  OPCODE_TEXT = 0x1
  OPCODE_BINARY = 0x2
  OPCODE_CLOSE = 0x8
  OPCODE_PING = 0x9
  OPCODE_PONG = 0xa
  
  # UUIDs used by HyBi 07 opening handshake and frame masking.
  WEBSOCKET_ACCEPT_UUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
  
  # Opening handshake header names and expected values.
  UPGRADE_HEADER = 'Upgrade'
  WEBSOCKET_UPGRADE_TYPE = 'websocket'
  WEBSOCKET_UPGRADE_TYPE_HIXIE75 = 'WebSocket'
  CONNECTION_HEADER = 'Connection'
  UPGRADE_CONNECTION_TYPE = 'Upgrade'
  HOST_HEADER = 'Host'
  SEC_WEBSOCKET_ORIGIN_HEADER = 'Sec-WebSocket-Origin'
  SEC_WEBSOCKET_KEY_HEADER = 'Sec-WebSocket-Key'
  SEC_WEBSOCKET_ACCEPT_HEADER = 'Sec-WebSocket-Accept'
  SEC_WEBSOCKET_VERSION_HEADER = 'Sec-WebSocket-Version'
  SEC_WEBSOCKET_PROTOCOL_HEADER = 'Sec-WebSocket-Protocol'
  SEC_WEBSOCKET_EXTENSIONS_HEADER = 'Sec-WebSocket-Extensions'
  
  # Status codes
  STATUS_NORMAL = 1000
  STATUS_GOING_AWAY = 1001
  STATUS_PROTOCOL_ERROR = 1002
  STATUS_UNSUPPORTED = 1003
  STATUS_TOO_LARGE = 1004
  
  
  # vi:sts=4 sw=4 et
  
subject: Add a vi mode line to common.py.