On Wednesday 07 March 2012 14:09:38 John Moore wrote:
> Is there some means of determining how many query parameters are being
> passed, by looking $args, say? There's a kind of DOS attack which can
> bring down Java based webapps which do binding of request parameters to
> properties, and it seems to me that nginx used as a remote proxy server
> could probably prevent this simply by rejecting requests which had more
> than x query parameters.

You can simple utilize regexp functionality for such task, i.e.:

if ($args ~ "^(?:[^&]+&){16}") {
return 403;
}

http://nginx.org/en/docs/http/ngx_http_rewrite_module.html#if

wbr, Valentin V. Bartenev

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