def refresh(self):
key = '<STR_LIT>' % self.key<EOL>self._server.query(key, method=self._server._session.put)<EOL>
Refreshing a Library or individual item causes the metadata for the item to be
            refreshed, even if it already has metadata. You can think of refreshing as
            "update metadata for the requested item even if it already has some". You should
            refresh a Library or individual item if:

            * You've changed the Library Metadata Agent.
            * You've added "Local Media Assets" (such as artwork, theme music, external
                subtitle files, etc.)
            * You want to freshen the item posters, summary, etc.
            * There's a problem with the poster image that's been downloaded.
            * Items are missing posters or other downloaded information. This is possible if
                the refresh process is interrupted (the Server is turned off, internet
                connection dies, etc).