Implementation of refresh tokens.

new route .../user/refreshtoken

node_modules/cookie/index.js

@@ -120,7 +120,11 @@ function serialize(name, val, options) {
 
   if (null != opt.maxAge) {
     var maxAge = opt.maxAge - 0;
-    if (isNaN(maxAge)) throw new Error('maxAge should be a Number');
+
+    if (isNaN(maxAge) || !isFinite(maxAge)) {
+      throw new TypeError('option maxAge is invalid')
+    }
+
     str += '; Max-Age=' + Math.floor(maxAge);
   }