code: def _get_body_string(self):
          
          clen = self.content_length
          if clen > self.MEMFILE_MAX:
              raise HTTPError(413, 'Request entity too large')
          if clen < 0: clen = self.MEMFILE_MAX + 1
          data = self.body.read(clen)
          if len(data) > self.MEMFILE_MAX:  # Fail fast
              raise HTTPError(413, 'Request entity too large')
          return data
docs: read body until content-length or MEMFILE_MAX into a string. Raise
              HTTPError(413) on requests that are to large.