No upstream_response_time in access log file

[Maxim Dounin]

Hello!

On Sat, Nov 03, 2012 at 09:13:30AM -0400, jonefee wrote:

> i use nginx as reverse proxy server , and php-fpm as fast cgi upstream.
> i found some access in nginx access  log file doesen't has  a 
> "$upstream_response_time" value  but a  "-" character instead ,,,,  and also
> has "$response_time" value.
> why ?
> 
> for example:
> 
> 71.213.141.240 - 31/Oct/2012:13:09:34 +0800 POST
> /php/xyz/iface/?key=be7fc0cdf0afbfedff1e09ec6443823a&device_id=351870052329449&network=1&ua=LT18i&os=2.3.4&version=3.7&category_id=2&f_ps=10&s=5&ps=30&pn=1&pcat=2&up_tm=1351655451272
> HTTP/1.1 499 0($body_bytes_sent) - Dalvik/1.4.0 (Linux; U; Android 2.3.4;
> LT18i Build/4.0.2.A.0.62) 21($content_length) 2.448($request_time)
> -($upstream_response_time) - - -
> 
> the response_time is 2.448,,,but no upstream_response_time,,,,  the http
> response code is 499,,,,,dosen't mean that nginx did not finish the
> "connection"  and php-fpm even has no chance to "see" the access ?

The connection was closed by a client before nginx got anything 
from upstream, hence nginx closed upstream connection as well.  
The 499 status code logged to indicate this, and there is no 
$upstream_response_time for the same reason.

-- 
Maxim Dounin
http://nginx.com/support.html