code: def fieldstorage(self):
          
          if self._fieldstorage is None:
              if self._body is not None:
                  raise ReadBodyTwiceError()
  
              self._fieldstorage = cgi.FieldStorage(
                  environ=self._environ,
                  fp=self._environ['wsgi.input']
              )
  
          return self._fieldstorage
docs: `cgi.FieldStorage` from `wsgi.input`.