mod_auth_request + php5-fpm gives error 504 on POST requests, GET requests are okay

Sat Feb 23 23:32:45 UTC 2013

Setup: php5-fpm listening on socket + nginx 1.2.6
Wanted to use mod_auth_request for www authentication. Works fine for GET
requests, POST requests time out with error 504.
Error log:
2013年02月24日 00:13:03 [error] 24004#0: *13 auth request unexpected status: 504
while sending to client, client: 80.187.106.XXX, server: xxx.net, request:
"POST /test.php HTTP/1.1", host: "xxx.net", referrer:
"https://xxx.net/test.php"
With GET, as stated, and when testing the subrequest script directly,
everything works fine. Gives 201/401 header, empty body as it should.
 location ~ \.php$ {

 root /var/www;

 fastcgi_pass unix:/var/run/php5-fpm.sock;
 fastcgi_index index.php;
 fastcgi_intercept_errors on;
 error_page 404 /index.html;

 fastcgi_param DOCUMENT_ROOT /var/www;
 fastcgi_param SCRIPT_FILENAME
/var/www$fastcgi_script_name;
 fastcgi_param PATH_TRANSLATED
/var/www$fastcgi_script_name;

 include /etc/nginx/fastcgi.conf;

 auth_request /authenticator/www.php;
 }

 location = /authenitcator/www.php {
 fastcgi_pass unix:/var/run/php5-fpm.sock;
 fastcgi_param SCRIPT_FILENAME
/var/www$fastcgi_script_name;
 fastcgi_param PATH_TRANSLATED
/var/www$fastcgi_script_name;
 }
Does anyone have an idea?
/refghbn
Posted at Nginx Forum: http://forum.nginx.org/read.php?2,236524,236524#msg-236524