remove cookie

@@ -9,6 +9,7 @@ const sender = global.yoho.apmSender;
 const hostname = require('os').hostname();
 const routeEncode = require('./route-encode');
 const _ = require('lodash');
+const config = global.yoho.config;
 
 const forceNoCache = (res) => {
     if (res) {
@@ -80,6 +81,18 @@ exports.serverError = () => {
         logger.error(err);
 
         if (err && err.code === 401) {
+
+            res.clearCookie('_UID', {
+                domain: config.cookieDomain
+            });
+            res.clearCookie('_TOKEN', {
+                domain: config.cookieDomain
+            });
+
+            res.clearCookie('_SESSION_KEY', {
+                domain: config.cookieDomain
+            });
+
             if (req.xhr) {
                 err.data = {refer: helpers.urlFormat('/signin.html', {refer: req.get('Referer') || ''})};
                 return res.json(err);