Automatic Redirection and 404

Hi,

I'm currently developping my first website and I have a question about
redirection policy. The application is supposed to redirect the user
to the correct URL based on his/the browser preferred language. If the
user search for "http://site.com/foo", he's supposed to be redirected
to "http://site.com/en-US/foo".

The problem is it's my first dealing with SEO and as I understand, if
I automatically redirect the request before knowing if it will be
served and not return an 404, if the request return a 404 after being
redirected a search engine can still index the page. Is it true?

Thanks.

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