error_page and Content-Length: 0

[ash2k - <ash2kk@xxxxxxxxx>]

Здравствуйте! Помогите пожалуйста разобраться с проблемой.

FreeBSD 7.2-STABLE amd62, nginx/0.7.64
-------------------------------------------
$ telnet 127.0.0.1 5190
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET /a HTTP/1.0

HTTP/1.1 200 OK
Server: nginx
Date: Mon, 14 Dec 2009 10:32:34 GMT
Content-Type: image/png
Connection: close
-------------------------------------------
$ telnet 127.0.0.1 5190
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET /b HTTP/1.0

HTTP/1.1 404 Not Found
Server: nginx
Date: Mon, 14 Dec 2009 10:38:20 GMT
Content-Type: image/png
Connection: close
-------------------------------------------
$ telnet 127.0.0.1 5190
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET /c HTTP/1.0

HTTP/1.1 404 Not Found
Server: nginx
Date: Mon, 14 Dec 2009 10:40:10 GMT
Content-Type: image/png
Content-Length: 0
Connection: close
-------------------------------------------
Непонятно откуда берется заголовок "Content-Length: 0" - в PHP скрипте
его нет да и если добавить fastcgi_hide_header Content-Length то он
остается.
Во всех трех случаях отдается нормальная PNGшка, но в последнем
браузер ее не отображает из-за "Content-Length: 0" видимо.
Логика работы последнего (/c) location:
1. пытаемся считать из mogilefs несуществующей файл
2. на 404 переходим в @boxMogilefs
3. PHP скрипт возвращает 404
4. на 404 переходим в @boxUniversal404
5. PHP возвращает PNGшку

Конфиг:

server {
        listen                                  127.0.0.1:5190
default;
        access_log                              off;
        proxy_intercept_errors                  on;
        fastcgi_intercept_errors                on;
        recursive_error_pages                   on;
        error_page                              404
/img/imagenotfound.png;

        location /img/ {
            root                                /home/cropbox/www/linkme;
        }

        location = /a {
                set                             $box_source
/home/app_cropbox/img/imagenotfound.png;
                include                         fastcgi_params;
                fastcgi_param                   SCRIPT_FILENAME
/home/app_cropbox/cropbox/boxUniversal.php;
                fastcgi_param                   QUERY_STRING
source=$box_source&newMaxWidth=100&newMaxHeight=100&cutHeight=0;
                fastcgi_pass                    cropbox;
        }
        location = /b {
                error_page                      404 @boxUniversal404;
                set                             $box_filename
donotexist.png;
                set                             $box_newMaxWidth 100;
                set                             $box_newMaxHeight 100;
                set                             $box_cutHeight 0;
                return 404;
        }
        location = /c {
                set                             $box_filename dontexist.png;
                set                             $box_newMaxWidth 100;
                set                             $box_newMaxHeight 100;
                set                             $box_cutHeight 0;
                error_page                      404 = @boxMogilefs;
                mogilefs_domain                 <domain>;
                mogilefs_methods                GET;
                mogilefs_tracker                <ip>:<port>;
                mogilefs_pass $box_filename {
                    proxy_pass                  $mogilefs_path;
                    proxy_hide_header           Content-Type;
                    proxy_buffering             off;
                }
        }
        location @boxUniversal404 {
                set                             $box_source
/home/app_cropbox/img/imagenotfound.png;
                error_page                      404 /img/imagenotfound.png;
                include                         fastcgi_params;
                fastcgi_param                   SCRIPT_FILENAME
/home/app_cropbox/cropbox/boxUniversal.php;
                fastcgi_param                   QUERY_STRING
source=$box_source&newMaxWidth=$box_newMaxWidth&newMaxHeight=$box_newMaxHeight&cutHeight=$box_cutHeight;
                fastcgi_pass                    cropbox;
        }
        location @boxMogilefs {
                error_page                      404 @boxUniversal404;
                include                         fastcgi_params;
#                fastcgi_hide_header             Content-Length;
                fastcgi_param                   SCRIPT_FILENAME
/home/app_cropbox/cropbox/boxMogilefs.php;
                fastcgi_param                   QUERY_STRING
filename=$box_filename&newMaxWidth=$box_newMaxWidth&newMaxHeight=$box_newMaxHeight&cutHeight=$box_cutHeight;
                fastcgi_pass                    cropbox;
        }
}

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