http://l3tczdiiwoo63iwxty4lhs6p7eaxop5micbn7vbliydgv63x5zrrrfyd.onion/4.0.0/user-manual/appendix.html
If URLs are being added to the trust file, then that
is done. If the URL pattern matches the "+fast-redirects" action, it is then processed. Unwanted parts of the requested URL are
stripped. Now the rest of the client browser's request headers are processed.