Github user tequalsme commented on the issue:
https://github.com/apache/nifi/pull/1776
@jvwing Thanks for reviewing. This was a feature that my team added to our
Nifi fork some time ago. I think it was done because the existing functionality
does not support regular expressions, and was found to be more cumbersome to
use than simply setting dynamic attributes. However I agree with your point
that it doesn't make sense to have two custom header methods, so I will close.
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