Currently, we have Apache proxying from /hudson to localhost:8080/hudson working
just fine (vrsion 1.237). It doesn't append ?from= in the request string nor
does it reply with an URL.

However, it seems the new login script (version 1.251) insists on replying with
an incorrect URL which screws up redirection after login. In my case, the
replied URL was $HOST_NAME, instead of $HOST_NAME/hudson.