[Zope] How to get hands on url with hash?

Is it possible (or even intended, did'nt read any RFCs regarding this) to retreive any url like http://www.example.com/index_html#hash (<- note: hash!) from the request? I need this for a login-redirect, the user clicks on a link like the one above and zope needs authentication (done by CookieCrumbler). I store the referrer in field called came_from where I can redirect (CookieCrumbler does this) the browser to after login. What do you think? Jürgen