POST пуст (whmcs)

[nonethree]

Поставил nginx admin, плагин для cPanel (набор
скриптов для генерации конфигов итд.). В
качестве фронтенда к apache.

Обнаружилась такая проблема, помогите
решить пожалуйста.

Воспроизводимость: Заказываем в whmcs
продукт -> переходим к странице выбора
оплаты -> жмём кнопку -> получаем пустую
страницу.

В логе строка:  - - [27/Apr/2011:19:42:02 +0700] "POST
/cart.php?a=add HTTP/1.1" 200 0 "http://www.domain.ru/cart.php" [^]
"Mozilla/5.0 (Windows; U; Windows NT 6.1; ru; rv:1.9.2.15)
Gecko/20110303 Firefox/3.6.15 WebMoney Advisor"
обратите внимание на размер, он
нулевой.

Конфиги:
server {
            listen   domain:80;
            server_name  domain.ru;

            access_log /usr/local/apache/domlogs/doman.ru combined;
                error_log /var/log/nginx/vhost-error_log warn;

            location /  {
                        root   /home/user/public_html/billing;
                        index  index.html index.php;
            }

            location = /announcements {
                        rewrite ^  /announcements.php  last;
            }

            location /announcements/ {
                        rewrite 
^/announcements/([0-9]+)/[A-Za-z0-9_-]+.html$ /announcements.php?id=$1
last;
            }

            location = /downloads {
                        rewrite ^  /downloads.php  last;
            }

            location /downloads/ {
                        rewrite ^/downloads/([0-9]+)/([^/]*)$
/downloads.php?action=displaycat&catid=$1 last;
            }
            location = /knowledgebase {
                        rewrite ^  /knowledgebase.php  last;
            }
            location /knowledgebase/ {
                        rewrite 
^/knowledgebase/([0-9]+)/[A-Za-z0-9_-]+.html$
/knowledgebase.php?action=displayarticle&id=$1 last;
                        rewrite  ^/knowledgebase/([0-9]+)/([^/]*)$
/knowledgebase.php?action=displaycat&catid=$1 last;
            }

            # pass the PHP scripts to FastCGI server listening on
127.0.0.1:9000
            #location ~ .php$ {
            #            fastcgi_pass 127.0.0.1:9000;
            #            fastcgi_index index.php;
            #            include /usr/local/nginx/conf/fastcgi_params;
            #            fastcgi_param SCRIPT_FILENAME
/xxx/xxx/xxx/public_html/$fastcgi_script_name;
            #}
            location ~ .php$ {
                        proxy_pass http://domain:8081;
                        include proxy.inc;
            }


}



Содержимое proxy.inc
proxy_connect_timeout 59s;
proxy_send_timeout   600;
proxy_read_timeout   600;
proxy_buffer_size    64k;
proxy_buffers     16 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
proxy_pass_header Set-Cookie;
proxy_redirect     off;
proxy_hide_header  Vary;
proxy_set_header   Accept-Encoding '';
proxy_ignore_headers Cache-Control Expires;
proxy_set_header   Referer $http_referer;
proxy_set_header   Host   $host;
proxy_set_header   Cookie $http_cookie;
proxy_set_header   X-Real-IP  $remote_addr;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass_request_body on;
proxy_pass_request_headers on;

Хидеры запроса:
(Request-Line)	POST /cart.php?a=checkout HTTP/1.1
Host	www.domain.ru
User-Agent	Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101
Firefox/4.0
Accept	text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language	ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding	gzip, deflate
Accept-Charset	windows-1251,utf-8;q=0.7,*;q=0.7
Keep-Alive	115
Connection	keep-alive
Referer	http://www.domain.ru/cart.php?a=checkout
Cookie	SESSca600fd34e3e6b29a416f94be6b77e6a=bc0913a5aa3d835a9d48b36c3578dd6d;
SESS30177d84584fca240fab4af9b25a35fd=8ea9e1c394a61e89919acad3e4b44227;
SESScbdf0a2acbf747235ff7722186082ba4=67cb1090d5ef6f87ceea1d21f5868468;
PHPSESSID=29676bbdfe2948eb189fe43a1b054058
Content-Type	application/x-www-form-urlencoded
Content-Length	104

Ответ:
(Status-Line)	HTTP/1.1 200 OK
Server	nginx admin
Date	Sun, 01 May 2011 08:56:51 GMT
Content-Type	text/html; charset=utf-8
Connection	keep-alive
X-Powered-By	PHP/5.2.17
Expires	Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control	no-store, no-cache, must-revalidate, post-check=0,
pre-check=0
Pragma	no-cache
Content-Length	0

Posted at Nginx Forum: http://forum.nginx.org/read.php?21,194792,194792#msg-194792