Бьюсь головой апстол уже не превый день (сначала грешил на пхп и сложную структуру приложения - но вот написал тупо скрипт который шлёт Last-Modified заголовок )

Дебаг лог:

...

2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi record length: 495
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "X-Powered-By: PHP/5.3.2-1ubuntu4.2"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "Set-Cookie: PHPSESSID=07471fd9175dae329c6242db5bb7ea56; path=/"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "Expires: Mon, 02 Aug 2010 11:49:50 GMT"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "Cache-Control: public, max-age=10800"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "Last-Modified: Mon, 02 Aug 2010 07:56:56 GMT"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header: "Content-type: text/html"
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi parser: 1
2010/08/02 12:49:50 [debug] 18330#0: *1 http fastcgi header done
2010/08/02 12:49:50 [debug] 18330#0: *1 charset: "" > "utf-8"
2010/08/02 12:49:50 [debug] 18330#0: *1 HTTP/1.1 200 OK
Server: nginx/0.8.42
Date: Mon, 02 Aug 2010 08:49:50 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
X-Powered-By: PHP/5.3.2-1ubuntu4.2
Set-Cookie: PHPSESSID=07471fd9175dae329c6242db5bb7ea56; path=/
Expires: Mon, 02 Aug 2010 11:49:50 GMT
Cache-Control: public, max-age=10800

2010/08/02 12:49:50 [debug] 18330#0: *1 write new buf t:1 f:0 0000000001317E50, pos 0000000001317E50, size: 348 file: 0, size: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http write filter: l:0 f:0 s:348
2010/08/02 12:49:50 [debug] 18330#0: *1 http cacheable: 0
2010/08/02 12:49:50 [debug] 18330#0: *1 http upstream process upstream
2010/08/02 12:49:50 [debug] 18330#0: *1 pipe read upstream: 1
2010/08/02 12:49:50 [debug] 18330#0: *1 pipe preread: 261
2010/08/02 12:49:50 [debug] 18330#0: *1 readv: 1:3576
2010/08/02 12:49:50 [debug] 18330#0: *1 pipe recv chain: 0
....

Конфиг:


server {
listen 80;

server_name test;
charset utf-8;
gzip off;
ssi on;

error_log nginx.error.log debug;
access_log nginx.access.log;


rewrite ^/sitemap(.*)\.xml /sitemap.php last;
rewrite /robots.txt /robots.php last;

location @phpfcgi {
if_modified_since off;

fastcgi_connect_timeout 75;
fastcgi_read_timeout 360;
fastcgi_send_timeout 360;
fastcgi_pass 127.0.0.1:8080; #unix:/tmp/phpfcgi.sock;
include /etc/nginx/fastcgi_params;
fastcgi_pass_header Last-Modified;
fastcgi_param SCRIPT_FILENAME /home/error500/www/release_3/var/www/index.php;

}

location ~ \.(php|php/.*)$ {
if_modified_since off;

fastcgi_index index.php;
fastcgi_connect_timeout 75;
fastcgi_read_timeout 240;
fastcgi_send_timeout 240;
fastcgi_pass 127.0.0.1:8080; #unix:/tmp/phpfcgi.sock;
fastcgi_pass_header Last-Modified;
include /etc/nginx/fastcgi_params;
fastcgi_param SCRIPT_FILENAME /home/error500/www/release_3/var/www$fastcgi_script_name;
}

location / {
error_page 404 =200 @phpfcgi;
root /home/error500/www/release_3/var/www;
index index.shtml index.html index.htm index.php;
}
}

Что не так делаю?
Посылал заголовок с параметром false ( header('xxxxxxxx', false) ) тогда Last-Modified но не мой а тот что инжинкс обнаружил у самого РНР файла.