[Catalyst] Conditional GET with Catalyst::Controller::REST

[Gavin Carr]

I'm seeing a weird problem trying to get conditional GETs
working under Catalyst::Controller::REST (0.66). 

Short version is that everything works beautifully when 
doing a HEAD, and my 304 is happily returned, but the same 
code on a GET causes a 500, with nothing helpful logged.

Code snippet is:

  sub index_GET {
    my ($self, $c) = @_;

    my $sset = $c->stash->{sset} or return;

    my $ifmod_ts = $c->request->headers->if_modified_since;
    my $sset_ts = $sset->modify_ts->epoch;
    if ($ifmod_ts && $ifmod_ts == $sset_ts) {
      $c->log->debug("not modified: ifmod_ts == sset_ts ($sset_ts)");
      $c->response->status(304);
      $c->log->debug('Status: ' . $c->response->status);
      return 1;
    }

    # Rest of GET
    # ...
  }

In the logs I see the two debug lines, and then nothing else:

  [debug] not modified: ifmod_ts == sset_ts (1222241031)
  [debug] Status: 304

Any cluesticks as to what might be going on here? If I change the 
status to almost anything else but 304 it all works fine. And it
doesn't seem to be the serialisation code either, as that explicitly
checks for 3xx status codes and exits.

Baffled. Anyone have conditional GETs working with C::C::REST?

Cheers,
Gavin