code: def _setup_decompressor(self, response):
          '''Set up the content encoding decompressor.'''
          encoding = response.fields.get('Content-Encoding', '').lower()
  
          if encoding == 'gzip':
              self._decompressor = wpull.decompression.GzipDecompressor()
          elif encoding == 'deflate':
              self._decompressor = wpull.decompression.DeflateDecompressor()
          else:
              self._decompressor = Nonf _setup_decompressor(self, response):
          '''Set up the content encoding decompressor.'''
          encoding = response.fields.get('Content-Encoding', '').lower()
  
          if encoding == 'gzip':
              self._decompressor = wpull.decompression.GzipDecompressor()
          elif encoding == 'deflate':
              self._decompressor = wpull.decompression.DeflateDecompressor()
          else:
              self._decompressor = None
docs: Set up the content encoding decompressor.