For some reason, Zope sometimes add a <base href=> tag in HTML documents. When Zope is used in combination with Apache and Apache is configured to rewrite incoming requests to a Zope folder that is not the root folder, this will cause trouble if there are any relative URLs in the documents. The way Zope determines the URL in the base href in combination with the way Apache rewriting works will often, after clicking around the site a few times, lead to something like www.mysite.org/mysiteroot/mysiteroot/mysiteroot/somedoc in the address line of the browser. It looks ugly, it tricks the browser from caching documents properly and visited links will look unvisited. Does anybody know why <base href> is inserted automatically? Any tricks for turning it off?