+--[[JeremieKoenig]]
+
+> Clearly those duplicate header settings are a mistake. But in all cases, the
+> `header => 0` came second, so it _should_ override the other value and
+> can't be causing this problem. (cgi_signin only sets it to 0, too).
+>
+> What version of formbuilder are you using? If you run ikiwiki.cgi at the
+> command line, do you actually see duplicate headers? I don't:
+
+ joey@kodama:~/html>REQUEST_METHOD=GET QUERY_STRING="page=index&do=edit" ./ikiwiki.cgi
+ Set-Cookie: ikiwiki_session_joey=41a847ac9c31574c1e8f5c6081c74d12; path=/
+ Date: Tue, 14 Aug 2007 18:04:06 GMT
+ Content-Type: text/html; charset=utf-8
+
+ <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+
+> Do thttpd and mini-httpd perhaps not realize that Set-Cookis is the start of
+> the headers? --[[Joey]]
+
+>> Thanks for your help: I think I found the problem!
+>> Ikiwiki outputs (in my case) the following
+>> error message on stderr, followed by an empty line:
+
+ /srv/ikiwiki/wc/index.mdwn: (Not a versioned resource)
+
+>> Probably thttpd and mini-httpd read stderr as well as stdout, while apache
+>> and boa don't. When using a shell-script wrapper as the CGI,
+>> which redirects ikiwiki's error output to /dev/null, it works better.
+
+>> The edit still fails to commit, because in my wiki, index.mdwn is
+>> pulled from the base wiki and somehow ikiwiki wants to change it
+>> rather that create it.
+
+>> --[[JeremieKoenig]]
+
+>>> If thttpd and mini-httpd interpret CGI's stderr as stdout, then
+>>> they're not properly following the CGI spec, and will break with tons
+>>> of cgi scripts besides ikiwiki. And of course there are many many cases
+>>> where ikiwiki might output to stderr, and that's the right thing to do.
+>>> So I don't see any way to address this in ikiwiki. --[[Joey]]
+
+>>>> (reported as [[debbug 437927]] and [[debbug 437932]]) --[[JeremieKoenig]]
+
+Marking [[done]] since it's not really an ikiwiki bug. --[[Joey]]