https://gist.github.com/ijokarumawak/60b9ab2038ef906731ebf4c0eee97176#file-31-nifi-websocket-template-xml
https://community.cloudera.com/t5/Community-Articles/US-Presidential-Election-tweet-analysis-using-HDF-NiFi-Spark/ta-p/246097
PostHttp Processor.