I'm learning how to develop module for nginx.

In one of my testing module, I'm trying to save several per-request
int/long states for each http request in my module. The easiest approach
seems to add these variables to ngx_http_request_s struct. Though I don't
really want to modify core modules.

Is there a recommended approach for saving per-request state without
modifying core http modules?

Thanks a lot!

--
Many Thanks!

Best Regards
James Gan
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