foo to bar with 301, but bar showing foo?

I want to do the following rewrite:

a request for foo.html should be redirected (301) to bar.html
a request for bar.html should internally be redirected to foo.html.

So:

http://example.com/foo.html should 301 to
http://example.com/bar.html

However,
http://example.com/bar.html should show the contents of foo.html.

How can I do this?


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