Hello nginx users!

I an running nginx/0.6.32 on Debian Lenny as a proxy server for Apache.

I have a script sleep.php which does nothing but sleeps for 120 seconds and then displays phpinfo.

When I call sleep.php bypassing nginx proxy, I can see output after 120 seconds. This is expected.

When I call sleep.php througt proxy, weird things happens:
Apache process is in status Sending Reply for 90 seconds.
In 90th second, another apache process is started, executing sleep.php
In 120th second, 1st process finishes
In 150th second 504 Gateway Time-out is sent to browser
In 210th second, 2nd process finishes

Is there any explanation for this weird behaviour?
Why 2nd process is started?

Thanks,
Martin



My nginx configuration:

nginx.conf:
----------

user www-data www-data;
worker_processes 1;

events {
worker_connections 1024;
use epoll;
}

http {
root /var/www/nginx-default/;
index index.html;
error_page 502 503 504 /50x.html;
error_log /var/log/nginx/error_log;

server_names_hash_max_size 2048;
#server_names_hash_bucket_size 128;

include /etc/nginx/mime.types;
default_type application/octet-stream;

sendfile on;
tcp_nopush on;
tcp_nodelay on;

keepalive_timeout 10;

log_format main
'$remote_addr - $remote_user [$time_local] '
'"$request" $status $bytes_sent '
'"$http_referer" "$http_user_agent" '
'"$gzip_ratio"';

#gzipping all text content
gzip on;
gzip_min_length 1100;
gzip_buffers 4 32k;
gzip_types text/plain text/html text/css application/x-javascript text/xml application/xml application/xml+rss text/javascript;
ignore_invalid_headers on;

client_header_timeout 3m;
client_body_timeout 3m;
send_timeout 3m;
connection_pool_size 256;
client_header_buffer_size 4k;
large_client_header_buffers 4 32k;
request_pool_size 4k;
output_buffers 4 32k;
postpone_output 1460;


server {
listen 11.22.33.44:80;

location /nginx_status {
stub_status on;
allow 99.88.77.66;
deny all;
}

location /server-status {
proxy_pass http://11.22.33.44:8080/server-status;
}

#default proxy settings for each virtual host
include /etc/nginx/proxy.conf;

}

#add fine-tuned virtual hosts
include /etc/nginx/sites-enabled/*.conf; #see below
}


proxy.conf:
-----------
location / {
client_max_body_size 10m;
client_body_buffer_size 128k;

proxy_send_timeout 90;
proxy_read_timeout 90;

proxy_buffer_size 4k;
proxy_buffers 16 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

proxy_connect_timeout 30s;

proxy_pass http://11.22.33.44:8080;
proxy_redirect off;


proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}



One of the sites:
-----------------

server {
listen 11.22.33.44:80;
server_name www.example.com;

include /etc/nginx/proxy.conf;

location ~* ^.+.(jpe?g|gif|png|ico|css|zip|tgz|gz|rar|bz2|doc|xls|exe|pdf|ppt|html?|txt|tar|mid|midi|wav|bmp|rtf|js|swf|avi|mp3)$ {
#forcing browser to cache locally static content for 30 days
expires 30d;
root /home/apache/example.com/www/htdocs;

#graceful fallback in case if static content doesn't exist
include /etc/nginx/proxy_fallback.conf; #see below
}
}


proxy_fallback.conf:
--------------------
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
if (!-f $request_filename) {
break;
proxy_pass http://11.22.33.44:8080;
}