Hello,

I believe the documentation for the limit_req_zone directive on this page
is wrong:

http://nginx.org/en/docs/http/ngx_http_limit_req_module.html

It says that a rate parameter is not optional, but it is. The directive
requires at least three parameters, but

limit_req_zone $binary_remote_addr zone=limit:64k sync;

or

limit_req_zone $binary_remote_addr zone=limit:64k zone=limit:64k;

are valid, omitting the rate. I see in the code that the default is 1r/s.
Perhaps updating the documentation to list the default would be good, or
changing the code to have the rate be required.

Thank you,

Aidan Carson
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