[mod_python] Output filters and 4xx error codes

Graham Dumpleton graham.dumpleton at gmail.com
Tue Dec 16 15:37:04 EST 2008

Post your Apache configuration snippet which shows in what context you
are setting up your fixup handler, ie., what URL subset.

For error documents, is it falling back to builtin Apache error
document strings or is ErrorDocument directive actually being set for
that error type?


2008/12/17 Andrew Ryan <andrewr at collab.net>:
> We have a mod_python tool which uses a FixupHandler to do some reverse
> proxying and inline-rewriting (for the general idea, see Graham's example in
> http://www.modpython.org/pipermail/mod_python/2006-March/020507.html). In
> the handler, we register an output filter, which does the inspecting and
> rewriting of content.
> This works great as long as the response code sent back is 2xx or 3xx. But
> in the case of a 4xx error code, the output filter doesn't run. Instead it
> seems to trigger the proxy server's "ErrorDocument" setting. This is
> problematic, since we'd like to see the real server's error page, not the
> default one from the reverse proxy server.
> As far as I can tell from inspecting the request object, the fixuphandler
> never sees the returned content, only the incoming request. And the
> outputfilter is the only place that the outgoing content is seen. If it
> isn't run, well, I don't see any other chance to modify the content that
> gets sent back to the client.
> Sounds like this person was having a similar problem, but there is no
> mention of a solution:
> http://mail-archives.apache.org/mod_mbox/httpd-users/200710.mbox/%3Ca7a2b76b
> 0710020850i3b2a0a25wd005f85350526ffa at mail.gmail.com%3E
> He was using mod_proxy though, which has the ProxyErrorOverride option. I
> don't think there's an equivalent in mod_python, or something similar, but
> I'm not sure.
> I was hoping someone else here had seen this problem and could offer a
> suggestion.
> Thanks
> --andrew
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