HTTP_HEADER filter not getting added until 'insert filters' phase

[sterling]

hi all -

After debugging the problem that doug brought up (headers are not getting
sent out when there is an error) I noticed that the HTTP_HEADER filter is
now added in the insert filters phase, which is too late because if there
is an error in anything from auth to fixups the header filter is not added
and hence is never called.

I believe it was this commit that created the
problem: http://www.geocrawler.com/archives/3/420/2001/5/0/5801349/


sterling