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Re: How to identify if URL is mod_perl handler

by sundialsvc4 (Abbot)
on Oct 29, 2012 at 20:21 UTC ( #1001418=note: print w/replies, xml ) Need Help??

in reply to How to identify if URL is mod_perl handler

Do you own the code in question, or are you trying to divine the workings of someone else’s site as a “black box?”

A URL is intended to be a “resource locator,” nothing more or less, such that you ought not be able to determine how the data is served by any examination of the output.   If you have access to the Apache configuration files, there are so many possible variations that a site-designer could have resorted to that you will have to, I think, trace through them example-by-example to determine how any particular one of them “shakes out.”

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Re^2: How to identify if URL is mod_perl handler
by vcTheGuru (Chaplain) on Nov 07, 2012 at 11:04 UTC


    I get full access to the code, but my boss doent want to retun a 404, instead he wish to return a 301 or 302 for any page that doesn't exist after checking some conditions.

    For example, all 404 from a sub directory must be redirected to index page of that directory. ie, any 404 from directory should load or simillar.

    Cheers !

    Cute Wallpapers


      Gah! I hate it when people "help" me like that. It breaks the model of the web. If a page doesn't exist, I want to know about it--but the "I" in question is one of my scripts, not me personally. If I get a 404, then I can recognize the condition and continue. My scripts, however, aren't clever enough to do so. If instead someone "helpfully" redirects me to something else, then I can't reliably detect the condition. (My home ISP does that to me, and it gripes me to no end.)

      If you're going to do something like that, I'd suggest making a 404 page that gives you the index page of the directory, instead. That way, it can be detected more easily, *and* allow people to find what they're looking for.


      Update: Having said that, getting the 301 or 302 code would be fine, too. Anything's better than some odd page with a 2xx status code.

      Update: Added sentence starting "My scripts"


      When your only tool is a hammer, all problems look like your thumb.

        If instead someone "helpfully" redirects me to something else, then I can't reliably detect the condition. (My home ISP does that to me, and it gripes me to no end.)

        Most times I've seen this malicious behaviour, it was "just" a DNS manipulation, i.e. it happend only for domain names not currently found in the DNS. Instead of returning NXDOMAIN, the provider's DNS server happily returned the IP address of a provider-supplied web server that offered some unhelpful search form. Verisign started this malicious behaviour in September 2003, and several providers happily copied it. Bypassing this malicious behaviour is quite easy, just don't use the DNS server(s) of your provider, but some free ones. Google offers and, I use them in my DSL router (that acts as name server for my LAN), because my provider "accidentally forgets" my opt-out every few weeks, and I'm quite happy with that setup.

        If you see the unhelpful page instead of a 404 page also for URLs with well-known servers, like, there are essentially two methods left: Either your provider infected your PC with that malware when you installed software for access to your providers dial-up network, or your provider uses a transparent proxy. Booting from a live linux cdrom easily shows what really happens. In the first case, the unhelpful page is gone as soon as you don't use the malware-infected operating system. The second case can be identified by the fact that any web server you connect to sees your request coming from a different address than the one your provider issued to your system. Pages like show you from what IP address your request comes from.


        Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

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