code: def body(self):
          
          if self._body is None:
              if self._fieldstorage is not None:
                  raise ReadBodyTwiceError()
  
              clength = int(self.environ('CONTENT_LENGTH') or 0)
              self._body = self._environ['wsgi.input'].read(clength)
              if isinstance(self._body, bytes):
                  self._body = self._body.decode('utf8')
  
          return self._body
docs: String from `wsgi.input`.