docs: function set(req, res) {
    var key = '' + req.args[0]
      , value = req.args[1];
  
    // already validated the config key/value so should be ok
    // to update the in-memory config, some config verification
    // methods perform side-effects, eg: dir
    this.conf.set(key, value);
    res.send(null, Constants.OK);
    if(key === ConfigKey.DIR) {
      this.log.notice('cwd: %s', process.cwd());
    }
  }