redirect 302 then redirect 304

I have multiple instances where I need use redirect_to in a controller,
and two of them exhibit the problem that I'm describing (the two that
update the record on which their acting)

On my development server (mac, webrick) I see two redirects, and the
client gets data back

127.0.0.1 - - [06/Jun/2008:13:32:16 CDT] "POST /events/49 HTTP/1.1" 302
97
http://127.0.0.1:3000/events/49/edit -> /events/49
127.0.0.1 - - [06/Jun/2008:13:32:16 CDT] "GET /events/49 HTTP/1.1" 304 0
http://127.0.0.1:3000/events/49/edit -> /events/49

On my deployment server (linux, apache) (running in dev and production
modes -- both were tested), I see a redirect to the same id with status
302 only, and the fcgi instance returns an error (nothing in log
indicating it).

What would cause the second (304) redirect?

Thank you,
Jay