anchor.diff:      if (isMaster(ctx)) {
         _removeSessionToken(ctx)
         .then((_) {
  -        ctx.sendJson(buildResponse({}));
  +        ctx.sendJson(buildResponse('handleLogout', {}));
           ctx.end();
         })
         .catchError((e, trace) {
  
positive.code:         ctx.res.redirect(Uri.parse('/error'));
        });
      } else {
        ctx.sendJson(buildResponse({ "message": "No privilege to logout!" }, valid: false));
        ctx.end();
      }
    }
  
negative.code:       isAuthed = true;
      }
  
      ctx.sendJson(buildResponse('handleIsAuthed', {
        "isAuthed": isAuthed
      }));
      ctx.end();
  