code: def _conditions(self, full_path, environ):
          
          magic = self._match_magic(full_path)
          if magic is not None:
              return magic.conditions(full_path, environ)
          else:
              mtime = stat(full_path).st_mtime
              return str(mtime), rfc822.formatdate(mtime)
docs: Return Etag and Last-Modified values defaults to now for both.