Github user sjoerdmulder commented on the issue: https://github.com/apache/zeppelin/pull/3052 I figured it out because we have a server side process (Spray client) doing health-checks and giving warnings about it: ``` Illegal response header: Illegal 'Date' header: Invalid input 'r', expected ", " or ' ' (line 1, pos 4): Thursday, July 5, 2018 7:50:52 AM UTC ^ ```
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