<Directory "APACHE_DOC_ROOT/do_not_modify" >
  Header set Cache-control "max-age=300"
  Header set Set-cookie "test-cookie"

  # Give a content-type to not_really_a_font.woff, otherwise
  # PageSpeed will refuse to proxy it.
  <FilesMatch "\.(woff)$">
    DefaultType text/plain
  </FilesMatch>
  <FilesMatch "\.(unknown)$">
    DefaultType None
  </FilesMatch>
</Directory>

Redirect 204 /no_content