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Apache's ErrorDocument directive lets you write a CGI script that will be invoked for all 404s.
IkiWiki could offer one as an optional wrapper; it would do much the same thing that the
existing recentchanges_link (or [[generic___39__do__61__goto__39___for_CGI]]) does when
encountering a nonexistent page.
I think it'd probably have to be a separate CGI script because the environment with which
404 handlers are invoked is somewhat odd, and because it needs to return a 404 status
(having said that, it might make sense for recentchanges_link to return 404 rather than
200 anyway if the page doesn't exist).
This would give IkiWiki the behaviour of many other wikis, where visiting a page that
does not yet exist prompts you to create it, without having to invoke the CGI for
successful requests.
Due to a well-known MSIE misfeature,
error output needs to be at least 512 bytes long, so some padding might also be required.
I'm happy to write such a script if there is interest. --[[smcv]]
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