mod_expires should honor "onsuccess" for its headers added or use some "early" equivalent. It gives wrong result for redirects otherwise.

F.e. there is a way to add or remove some headers just for redirect, like that:

Header always set Pragma no-cache env=redir
RewriteRule ^a\.html$ http://example.com/b.html [L,R=301,E=redir:1]

but combined with mod_expires such way not works. This example

<Files a.html>
ExpiresDefault "access plus 1 day"
</Files>

Header unset Cache-Control env=redir
Header unset Expires env=redir
Header always unset Cache-Control env=redir
Header always unset Expires env=redir
RewriteRule ^a\.html$ http://example.com/b.html [L,R=301,E=redir:1]

still have Cache-Control and Expires headers. Please fix this bug.