What does status code 000 mean in the Nginx logs? I have the following in the config:
location = /get-img.pl
{
limit_req zone=slow burst=10;
proxy_pass http://service_perl;
}
get-img.pl generates an image, writes it to disk and then returns "X-Accel-Redirect" to the image. Everything seems to be working just fine, I see delayed responses because of limit_req in the logs (with code 200). Sometimes there are responses with code 503 for "greedy" clients that exceed the burst=10 parameter. All as expected.
However, occasionally I see a bunch of requests (around 5 to 20 within a few seconds of each other) with status code 000 and 0 for the body size in the logs. They are always from the same IP address for the entire bunch, so I'm guessing it's requests that already went through internal "X-Accel-Redirect" redirect and then something happened. Connection aborted? Something else? Why not status code 503? That's where you come in with a helpful explanation. :)
In case it is relevant:
nginx version: nginx/1.4.2
built by gcc 4.1.2 20080704 (Red Hat 4.1.2-54)
TLS SNI support disabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-mail --with-mail_ssl_module --with-file-aio --with-ipv6 --with-cc-opt='-O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
