Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1841
Running the (old) application with the [linked
flow](https://gist.github.com/alopresto/dca35c3758ad09f2eb8e23f2e3204367) would
get an `SSLPeerUnverifiedException` on the certificate.
<img width="1920" alt="screen shot 2017-05-22 at 1 26 11 pm"
src="https://cloud.githubusercontent.com/assets/798465/26330385/7f8fffd2-3f00-11e7-8371-6d0ddd64fc6c.png";>
With the new version of the `httpclient` library, this is corrected and the
`400` response is received as expected.
```
2017-05-22 15:04:34,339 ERROR [Timer-Driven Process Thread-3]
o.a.nifi.processors.standard.GetHTTP
GetHTTP[id=31d14773-015c-1000-ca53-529cf87acf87] received status code 400:Bad
Request from https://www.googleapis.com/youtube/v3/commentThreads?key=
```
I had to explicitly add `httpcore` as a dependency to bring in the
`@ThreadSafe` annotation.
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