Github user VipinRathor commented on the issue:
https://github.com/apache/zeppelin/pull/2550
@krishna-pandey You are right. Setting "secure=true" in cookie will force
cookie to travel only over HTTPS. When Zeppelin is running over HTTP, browsers
won't send this 'secure' cookie back. So Zeppelin will generate new session id
every time when a request is made, therefore user sessions will not be
maintained. I've commented that line and added comment too.
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