code: def _init_decoder(self):
          
          # Note: content-encoding value should be case-insensitive, per RFC 7230
          # Section 3.2
          content_encoding = self.headers.get('content-encoding', '').lower()
          if self._decoder is None:
              if content_encoding in self.CONTENT_DECODERS:
                  self._decoder = _get_decoder(content_encoding)
              elif ',' in content_encoding:
                  encodings = [e.strip() for e in content_encoding.split(',') if e.strip() in self.CONTENT_DECODERS]
                  if len(encodings):
                      self._decoder = _get_decoder(content_encoding)
docs: Set-up the _decoder attribute if necessary.