>> `CGI::url` uses `REQUEST_URI`. So it could be used, but I don't see
>> how to get from the `CGI::url` to an url to the page that is being
>> edited. --[[Joey]]
+>>> (The right rune seems to be: `URI->new_abs(urlto($params{page}), $cgi->url))` --[[Joey]]
+
+---
+
+Update: This bug is worse than it first appeared, and does not only affect
+previewing. The cgi always has a `<base>` url, and it's always relative,
+and that can break various links etc. For example, when the 404 plugin
+displays a missing page, it has a Recentchanges link, which would be broken
+if the cgi was in an unusual place.
+
+`misctemplate` needs to *always* set an absolute baseurl. Which is a problem,
+since `misctemplate` is not currently passed a cgi object from which to
+construct one. --[[Joey]]
+
+Update: Worse and worse. `baseurl(undef)` can be a relative url, but
+nearly every use of it I can find actually needs to be absolute.
+the numerous `redirect($q, baseurl(undef))` all need to be absolute
+according to `CGI` documentation.
+
+So, I'm seriously thinking about reverting the part of
+[[todo/want_to_avoid_ikiwiki_using_http_or_https_in_urls_to_allow_serving_both]]
+that made `baseurl(undef)` relative.
+And I suppose, re-opening that todo. :( --[[Joey]]
+
+----
+
+This was fixed in version 3.20110105 [[done]] --[[Joey]]