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# Constants indicating WebSocket protocol version.
VERSION_HYBI01  = 1
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_CLOSE        = 0x1
OPCODE_PING         = 0x2
OPCODE_PONG         = 0x3
OPCODE_TEXT         = 0x4
OPCODE_BINARY       = 0x5

Add common.py. I forgot to add this to the last change (http://codereview.appspot.com/3999042/).