text: """
  Compatibility Support for Python 2.7 and earlier
  """
  
  import sys
  
  
  def get_all_headers(message, key):
      """
      Given an HTTPMessage, return all headers matching a given key.
      """
      return message.get_all(key)
  
  
  if sys.version_info < (3,):
      def get_all_headers(message, key):
          return message.getheaders(key)
  