[Zope] What's the idea behind the insertBase(...) in HTTPResponse ?

In some cases the HTTPResponse-Object adds an "<base href=....>" to your HTML-Output. For some reasons (virtual hosting with an ip-based caching and different domains for the same ip) i would disable this mechanism. It's easy to comment the insertBase(...)-Method in the HTTPResponse-Object but I've no idea of the side-effects. Has anyone some experience with this ? Martin