The timing of Nginx Access logging and nginx Logging

The timing of Nginx Access logging and nginx Logging

Take it for granted, so I made a low-level mistake...

Nginx access logs can record nginx access information, including the request address, Request Path, return code, and request processing time ..

Then the question arises: When did this log be recorded? Is the request recorded at nginx, or is it recorded only after all the requests are processed?

This is where I am stupid. access logs must be recorded as soon as the request is sent... No problem... o (* ￣ ︶ ￣ *) o

But in fact, when I describe the data contained in this request, the answer to this question is already in it...

"Contains the request address, Request Path, return code, request processing time, and other information .."

Therefore, this must be recorded after all the requests are processed. Therefore, no log in acccess does not indicate that the request is not sent to nginx, because it may be stuck in execution...