code: function loadFile(req, res) {
  		if (req.user) {
  			// User access is not allowed. This method is only for the collab server
  			writeError(403, res, 'Forbidden');
  			return;
  		}
  		var relativeFilePath = req.params['0'];
  		var hubid = req.params['hubId'];
  
  		return sharedProjects.getProjectPathFromHubID(hubid)
  		.then(function(filepath) {
  			if (!filepath) {
  				writeError(404, res, 'Session not found: ' + hubid);
  				return;
  			}
  			getTree(req, res);
  		});
  	}
docs: Get request from websocket server to load a file. Requires project HUBID and relative file path.