store private per request data from a module

[Qun-Ying]

Hi,

I would like to know is it possible to store some private per request data
structure (like a state machine that need to remember the current state due
to async operation, and continue from the previous state when data continue)
from a module without invading into nginx's ngx_http_request_t structure? Is
there a sample module code to look at?

Thanks
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