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I'm reading some nginx logs for some rather long-lasting requests (up to 10 seconds). In the log format, we're using the $time_local variable to record the time. But does this mean the time when the request started or when it finished? For a long-running request, these are quite distinct times, and I can't find anything in the ngx_http_log_module documentation to explain this.

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The $time_local variable contains the time when the log entry is written.

when the HTTP request header is read, nginx does a lookup of the associated virtual server configuration. If the virtual server is found, the request goes through six phases:

  • server rewrite phase
  • location phase
  • location rewrite phase (which can bring the request back to the previous phase)
  • access control phase
  • try_files phase
  • log phase

Since the log phase is the last one, $time_local variable is much more colse to the end of the request than it's start.

  • thanks.. can you show me where I could have found this in the documentation? – Philip Potter Oct 16 '12 at 11:34
  • 2
    nginx.com/docs.html The information is on the link "The Architecture of Open Source Applications Volume II" which is a good reference book. – m0ntassar Oct 16 '12 at 13:31
  • Looks like they've changed the URL. It's now at nginx.org/en/docs with the reference book at aosabook.org/en/nginx.html. – trss Apr 7 '18 at 10:50

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