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From Joshua Kugler <>
Subject Re: [users@httpd] Apache improvement suggestion
Date Wed, 11 May 2005 20:24:44 GMT
On Wednesday 11 May 2005 02:01, Uri Raz wrote:
>   Problem with that solution is that many surfers block the referrer field
> using a proxy or a firewall, including some surfers who browse my site and
> legitimately expect the graphics to come up. My idea is to have apache
> remember which IP requested for a page (a file with an appropriate
> extension / MIME type, e.g. HTML) in the last X seconds and allow only
> those who did get graphics files.
>   This does require managing a lookup table (and thus requires memory and
> CPU cycles), but as the table is kept at the IP level (host X requested a
> page - any page) it would grow in a linear fashion with the number of
> surfers (say a hash table), regardless of the number of files in the site.
> Any surfer who browses the site would have no problems, while a surfer who
> tries to get a graphics file linked from another site would get nothing.
>   This has two limitations - people who have surfed the site in the last X
> seconds (not very likely for a reasonable value of X, say 1 to 5 minutes),
> and several users who share a proxy so that one surfs the site and another
> surfs the site that links to objects in it. Though the solution is not 100%
> watertight, it looks to me like a significant improvement at a low cost.

Another problem that no one has mentioned is that some big outfits, say AOL, 
use "proxy farms."  Thus, it is possible for one client, every request for 
your site would come from a different IP, thus even legitimate browsers 
wouldn't be able to access your site.

j----- k-----

Joshua Kugler
CDE System Administrator

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