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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