Github user ktseytlin commented on the issue:
https://github.com/apache/nifi/pull/1112
This is obviously a pretty awful drawing I threw together... but it shows
what AWS is like in an enterprise. For every single service I ever want to
execute, I need to go through a proxy. Hence why this bug fix is needed. The
only situation in which this wouldn't occur is if the enterprise specifically
opened up the endpoints to each service, which would allow it to avoid going
through the proxy.

@jvwing Hope this is helpful for regarding our previous conversation about
proxy things :)
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---