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 and content_encoding in self.CONTENT_DECODERS:
              self._decoder = _get_decoder(content_encoding)
docs: Set-up the _decoder attribute if necessary.