code: def simple_response(self, status, msg=''):
          
          status = str(status)
          proto_status = '%s %s\r\n' % (self.server.protocol, status)
          content_length = 'Content-Length: %s\r\n' % len(msg)
          content_type = 'Content-Type: text/plain\r\n'
          buf = [
              proto_status.encode('ISO-8859-1'),
              content_length.encode('ISO-8859-1'),
              content_type.encode('ISO-8859-1'),
          ]
  
          if status[:3] in ('413', '414'):
              # Request Entity Too Large / Request-URI Too Long
              self.close_connection = True
              if self.response_protocol == 'HTTP/1.1':
                  # This will not be true for 414, since read_request_line
                  # usually raises 414 before reading the whole line, and we
                  # therefore cannot know the proper response_protocol.
                  buf.append(b'Connection: close\r\n')
              else:
                  # HTTP/1.0 had no 413/414 status nor Connection header.
                  # Emit 400 instead and trust the message body is enough.
                  status = '400 Bad Request'
  
          buf.append(CRLF)
          if msg:
              if isinstance(msg, six.text_type):
                  msg = msg.encode('ISO-8859-1')
              buf.append(msg)
  
          try:
              self.conn.wfile.write(EMPTY.join(buf))
          except socket.error as ex:
              if ex.args[0] not in errors.socket_errors_to_ignore:
                  raise
docs: Write a simple response back to the client.