Github user peter-toth commented on the issue:

    https://github.com/apache/nifi/pull/2630
  
    This improvement of LivySessionController uses the 
KerberosCredentialsService to fetch a principal and a keytab and provide SPNEGO 
authentication towards a Livy server.
    
    In the implementation I switched from HttpURLConnections to HttpClient, 
which can be configured to do an SPNEGO handshake. 


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