I have a few "filter" forms on my site, to let people filter the content they're seeing. I set a cookie when they select these items, so that their preferences are saved.
When they click on the filters they end up with a URL like
www.example.com/filters/news,sport/
I then use the cookies so that if they navigate to
www.example.com/
afterwards, they get automatically redirected via PHP's Header function to
www.example.com/filters/news,sport/
I do this (changing the URL as well as just changing the content) so that if they want to share a URL with another person, they see the same content.
My question is what should the HTTP code on that redirect be? I think 307 (Temporary Redirect), but I'm far from sure.