text: # Copyright 2012, 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.
  
  import sys
  import zlib
  
  from mod_pywebsocket import common
  from mod_pywebsocket import stream
  
  
  def web_socket_do_extra_handshake(request):
      pass
  
  
  def web_socket_transfer_data(request):
      compress = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED,
                                  -zlib.MAX_WBITS)
      compressed_message = compress.compress(b'close message')
      compressed_message += compress.flush(zlib.Z_SYNC_FLUSH)
      compressed_message = compressed_message[:-4]
      header = stream.create_header(
          opcode=common.OPCODE_CLOSE,
          payload_length=len(compressed_message),
          fin=1,
          rsv1=1,
          rsv2=0,
          rsv3=0,
          mask=False)
      request.connection.write(header + compressed_message)
  