exception for NGINX limit_req_zone

Francis Daly francis at daoine.org
Sun Jul 22 18:35:27 UTC 2012

On Sun, Jul 22, 2012 at 11:05:12PM +0800, fhal wrote:

Hi there,

> Thanks very much for your reply.
> It still doesn't work.

What, precisely, do you mean by "doesn't work"?

Be specific. (Do you mean "this one is being limited and I don't want
it to be", or "that one is not being limited and I do want it to be",
or something different?)

Read my mail again. I included the exact (small) nginx.conf fragment
used. I included the exact test command. I described what I saw. I
described what I expected to see.

Can you do the same, just so that I can make sure that I am repeating
exactly what you did?

> The URL I want to exclude is like
> /forum.php?mod=image&aid=1289568&size=300x300&key=6831686b88a927b0d9646529f88f5052&nocache=yes&type=fixnone
> Does it because there are too many parameters, the map is not working?

It still works for me.

for i in $(seq 4); do
 curl -I ''
 sleep 1

(Note: that has mod=imag, and so *should* be limited)

I see 3x HTTP 200 + 1x HTTP 503

for i in $(seq 4); do
 curl -I ''
 sleep 1

(Note: that has mod=image, and so *should not* be limited)

I see 4x HTTP 200.

My nginx.conf http section:

http {
    map $arg_mod $forum_limit {
        default  $binary_remote_addr;
        image    '';
    limit_req_zone  $forum_limit  zone=refresh:128m   rate=1r/m;

    include fastcgi.conf;
    server {
        location ~*^/(home|forum|portal).php$  {
            limit_req zone=refresh burst=2 nodelay;
            fastcgi_pass unix:php.sock;

Francis Daly        francis at daoine.org

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