getUser Authenticator is returning null | Confluence 4.2.4

[Peter Schober]

* Cantor, Scott <cantor.2 at osu.edu> [2012-06-16 19:24]:
> On 6/16/12 6:37 AM, "Peter Schober" <peter.schober at univie.ac.at> wrote:
> >I wonder why you're using custom HTTP Headers to pass any attributes
> >to Tomcat when you're using AJP.
> 
> I believe the confluence plugin is currently headers only. The Java API is
> different for using headers vs. CGI variables, and the code only handles
> headers IIRC.

OK, then only the "custom" aspect of that question remains.
(Also explains why I couldn't get variables to work on that site I
mentioned, but I wrote that off to historic versions of everything
involved),
-peter