Netweaver Portal IView redirects not relative

Hi,

you guys are my last hope because i can not find anything useful for my problem.

Lets assume we got some IViews (URL, Dynpro, whatever) and we're running the portal in our intranet over HTTPS, watch the browser requests and we see something like this, which is totally normal:

GET https://HOST/irj/servlet/prt/portal/prtroot/pcd!3aportal_content!2fother_vendors!2fevery_user!2PATH_TP_IVIEW?windowId=WID1392796601641

And we get a response location header:

Location https://HOST:443/PATH_TO_JSP?themeName=customer/THEME&themePath=/irj/portalapps/com.sap.portal.design.portaldesigndata/themes/portal&browserMapping=nn7

The redirect is fine and the location is correct. What bugs me is, that this is NOT a relative redirect. It even adds the port 443! Well, this is not a problem in our intranet, but we provide access to our portal through a reserve proxy, which accesses the portal server through http ONLY, due to a security restriction that no encrypted content can pass from the WEB/DMZ to our lan (our portal server resides in our lan). Due to that, the above redirect redirects HARD to HTTP, which causes browsers to deny these requests and have the user to allow unsecure content. (We force SSL from outside, so this IS a REAL problem for us).

Does anybody know how these iview redirects are implemented/handled and why they are absolute and not relative? We are currently running 7.0...