code: def encoding(self) -> _Encoding:
          
          if self._encoding:
              return self._encoding
  
          # Scan meta tags for charset.
          if self._html:
              self._encoding = html_to_unicode(self.default_encoding, self._html)[0]
              # Fall back to requests' detected encoding if decode fails.
              try:
                  self.raw_html.decode(self.encoding, errors='replace')
              except UnicodeDecodeError:
                  self._encoding = self.default_encoding
  
  
          return self._encoding if self._encoding else self.default_encoding
docs: The encoding string to be used, extracted from the HTML and
          :class:`HTMLResponse <HTMLResponse>` headers.