Limiting concurrent connections by key?

Question

Nginx

Hello. I use X-Accel-Redirect to upload files, but I can't figure out how to limit the number of simultaneous connections by a special api key that is passed in the download link url.
I would arrange limit_zone, but I don’t understand how to point it to the key.
Thanks in advance.

Answer 1

nginx.org/ru/docs/http/ngx_http_limit_req_module.h...
you can use any variable as a key