How to limit RPS for proxy_pass in Nginx?

Question

Nginx

How to apply ngx_http_limit_req_module for proxy_pass in Nginx?
Or how to limit the number of requests per second for calls to the backend?
Nginx acts as a caching proxy

Answer 1

I made a separate server with limit_req based on the same Nginx and made proxy_pass on itself
client -> Nginx(cache, proxy_pass) -> Nginx(limit_req) -> domain

Answer 2

What is the difficulty? proxy_pass in some location, write limit_req inside the location. The zone is described in the http section.