HTTP 408 Login timeout

[C S]

I'm dealing with a problem where if a user hits a secured page and is
forwarded to a login page (using Form Auth).  If the user sits on that login
page for too long, and then try to login they are confronted with a nasty
HTTP 408 error.  I don't know if this behaviour is part of the servlet spec,
but rather then giving the user an error, could they be forwarded to a
welcome page for the app?  Or perhaps to the context's "/"?