错误时不缓存

@@ -5,8 +5,20 @@
 const headerModel = require('../models/header');
 const logger = global.yoho.logger;
 
+const forceNoCache = (res) => {
+    if (res) {
+        res.set({
+            'Cache-Control': 'no-cache',
+            Pragma: 'no-cache',
+            Expires: (new Date(1900, 0, 1, 0, 0, 0, 0)).toUTCString()
+        });
+    }
+};
+
 exports.notFound = () => {
     return (req, res, next) => {
+        forceNoCache(res);
+
         if (req.xhr) {
             return res.status(404).json({
                 code: 404,
@@ -32,6 +44,8 @@ exports.notFound = () => {
  */
 exports.serverError = () => {
     return (err, req, res, next) => {
+        forceNoCache(res);
+
         logger.error(`error at path: ${req.url}`);
         logger.error(err);
         if (!res.headersSent) {