<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def post(self, request, uri):
 """ Set node data for uri, return rendered content. JSON Response: {uri: x, content: y} """

        uri = self.decode_uri(uri)
        data, meta = self.get_post_data(request)
        meta['author'] = auth.get_username(request)
        node = cio.set(uri, data, publish=False, **meta)
        return self.render_to_json(node)