diff --git a/server/web3service/controllers/jwt.js b/server/web3service/controllers/jwt.js
index 9a7b714..818902b 100644
--- a/server/web3service/controllers/jwt.js
+++ b/server/web3service/controllers/jwt.js
@@ -7,6 +7,12 @@ const jwt = require('jsonwebtoken');
 const LOCK_KEY = 'getJwtLock:';
 const jwksKeyHash = {};
 
+async function refreshKey() {
+  while (true) {
+    await utils.sleep(1000 * 60 * 5);
+  }
+}
+
 async function asyncGetKey(jkwsUri, header, cb) {
   await app.lock(LOCK_KEY + jkwsUri);
   try {
@@ -24,6 +30,7 @@ async function asyncGetKey(jkwsUri, header, cb) {
         if (!err) {
           jwksKeyHash[jwksUri] = {
             'key': key,
+            'header': header,
             'lastRefreshTime': utils.getUtcTime()
           };
         }