Accept-Language

Scenario:

I own a website in French. Someone from the UK visits my website (with an English browser of course). Drupal recognizes its language and serves the English version of the page.

How to do this ?

Content-negociation based on the browser language (Accept-Language in Apache terms, but I don't know it has any importance with Drupal, I think). That seems pretty basic to me, bt I may be wrong (I am not a coder).

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I'm curious about how the Accept-language header field works, as outlined at http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html and if we could take advantage of that with i18n. My understanding is that the browser would send its preferred language(s) through the get header, so the server could parse that and return an appropriate page.

An example of this is given at http://www.w3.org/TR/cooluris/#conneg

might return:

HTTP/1.1 200 OK