docs: function getConfig(uuid, options, callback) {
      assert.string(uuid, 'uuid');
  
      if (typeof (options) === 'function') {
          callback = options;
          options = undefined;
      }
      assert.func(callback, 'callback');
  
      var opts = { path: sprintf('/configs/%s', uuid), query: {} };
      if (options && options.headers) {
          opts.headers = options.headers;
      }
  
      return (this.get(opts, callback));
  }