Github user jtstorck commented on the issue:
https://github.com/apache/nifi/pull/1900
@mcgilman There are a couple issues with the proxying support:
* When the proxy that sets the X-Forwarded-* headers is running on a
non-standard port for HTTP or HTTPS, the "X-Forwarded-Host" header value can
contain the host and the port, such as localhost:8008 or localhost:8443.
* There are some resources that are at absolute paths, like in nifi-docs.
The documentation is showing up, but the css isn't loading.
* If the NiFi service is terminated, and the NiFi client UI shows its
general error page, the "home" link does not point the browser back at the
proxy's URL for NiFi.
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