exception for NGINX limit_req_zone

Francis Daly francis at daoine.org
Fri Jul 20 22:38:49 UTC 2012

On Fri, Jul 20, 2012 at 09:48:04PM +0800, fhal wrote:

Hi there,

> I got a problem with NGINX limit_req_zone. Anyone can help? The problem is that, I want to limit user access to some specific URL, for example:
> /forum.php?mod=forumdisplay?
> /forum.php?mod=viewthread&***
> But, I do want to add an exception for below URL,
> /forum.php?mod=image&*

For nginx "location" matches, these three are all the same, and are all
exactly "/forum.php". The "location" goes from the first / to just before
the first ? or #.

That is why your configuration is not doing what you want.

> location ~*^/(home|forum|portal).php$ {
>     root           /web/www;
>     limit_conn   addr  5;
>     limit_req zone=refresh burst=5 nodelay;
>     fastcgi_pass   unix:/tmp/nginx.socket;
>     fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
>     include        fastcgi_params;
>     }

I do not know what the solution is, but I expect it will involve doing
something different based on the value of $arg_mod, within that location

How is limit_req_zone zone=refresh defined? Would using "map" to set
the relevant $variable to empty if $arg_mod is "image" be appropriate?

Good luck with it,

Francis Daly        francis at daoine.org

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