As per my understanding upstream_response_time is subset of request_time.

# request_time : This shows how long Nginx dealt with the request
# upstream_response_time: Gives us the time it took our upstream server (in this case Apache/mod_wsgi) to respond

request_time = time nginx got the request to the time it sends the reponse to client(browser).

request_time = variable component + upstream_response_time

Can anybody explain me what exactly the "variable component" is ?


Regards
Kamalakar