Static files cookieless on NGINX + php5-fpm

Hi,
i'm approaching with NGINX web server in these days.
I used IIS before and I must say that NGINX is fantastic.

After first simple settings, now i want optimize some functionality.

I use nginx to serve php and static files, and i want serve static files(css, js, images) without cookie.
i try to do this using fastcgi_hide_header Set-Cookie; but checking http request for static files i find always cookie request.

This is an example:

Response
HTTP/1.1 200 OK
Server: nginx
Date: Tue, 29 Apr 2014 10:41:30 GMT
Content-Type: image/jpeg
Content-Length: 34983
Last-Modified: Wed, 23 Apr 2014 15:38:45 GMT
Connection: keep-alive
Accept-Ranges: bytes

Request:
GET /public/normal/1396201785-38.jpg HTTP/1.1
Host: www.mydomain.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:28.0) Gecko/20100101 Firefox/28.0
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: it-IT,it;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://www.mydomain.com/
Cookie: PHPSESSID=r91ognoe8uk3j68e0s3bqp0082
Connection: keep-alive


In my site config file i have this:

#URL canonicalization
server {
listen 80;
server_name mydomain.com;
return 301 http://www.mydomain.com$request_uri;
}

server {
listen 80; ## listen for ipv4; this line is default and implied
#listen [::]:80 default_server ipv6only=on; ## listen for ipv6

root /usr/share/nginx/www/mydomain/wwwroot;

server_name www.mydomain.com;


##
# Errors page
##

error_page 404 /404.php;
# redirect server error pages to the static page /50x.html
#
#error_page 500 502 503 504 /50x.html;
#location = /50x.html {
# root /usr/share/nginx/www;
#}


#Add trailing slash
if (!-e $request_filename){
set $rule_1 1$rule_1;
}
if (!-e $uri){
set $rule_1 2$rule_1;
}
if ($uri !~ "(.*).txt$"){
set $rule_1 3$rule_1;
}
if ($uri !~ "(.*).ico$"){
set $rule_1 4$rule_1;
}
if ($uri !~ "(.*).xml$"){
set $rule_1 5$rule_1;
}
if ($uri !~ "(.*)public"){
set $rule_1 6$rule_1;
}
if ($uri !~ "(.*)theme"){
set $rule_1 7$rule_1;
}
if ($uri !~ "(.*)/$"){
set $rule_1 8$rule_1;
}
if ($rule_1 = "87654321"){
rewrite ^/(.*)$ /$1/ permanent;
}


set $mobile_rewrite do_not_perform;
## chi http_user_agent for mobile / smart phones ##
if ($http_user_agent ~* "(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|iris|kindle|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino") {
set $mobile_rewrite perform;
}
if ($http_user_agent ~* "^(1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-)") {
set $mobile_rewrite perform;
}

location / {
autoindex off; #no directory listing

#try_files $uri $uri/ $uri/index.php;

# Rewriting for sitemap, feed and robots
rewrite ^/sitemap.xml$ /sitemap.php last;
rewrite ^/feed.xml$ /feed.php last;
rewrite ^/robots.txt$ /robots.php last;


#Rewrite page tag with type content with paging
rewrite ^/tag-(.*)/(.*)/([0-9]+)/$ /?page=tag/&cat=$1&id=$2&pag=$3 last;

#Rewrite page tag with type content
rewrite ^/tag-(.*)/(.*)/$ /?page=tag/&cat=$1&id=$2 last;

#Rewrite page tag with type
rewrite ^/tag-(.*)/$ /?page=tag/&cat=$1 last;

#Rewrite page level 2(category) with paging
rewrite ^/(.*)/(.*)/([0-9]+)/$ /?page=$1/&cat=$2&pg=$3 last;

#Rewrite page level 3 (content)
rewrite ^/(.*)/(.*)/(.*)/$ /?page=$1/&cat=$2&id=$3 last;

#Rewrite page level 1 with paging
rewrite ^/(.*)/([0-9]+)/$ /?page=$1/&pg=$2 last;

#Rewrite page level 2 (category)
rewrite ^/(.*)/(.*)/$ /?page=$1/&id=$2 last;

#Rewrite page level 1 es. contatti/
if (!-e $request_filename)
{
rewrite ^/(.*)/$ /?page=$1/ last;
}


# Uncomment to enable naxsi on this location
# include /etc/nginx/naxsi.rules
}

location ~* /public/normal/
{
if ($mobile_rewrite = perform) {
rewrite ^/public/normal/(.*)$ /public/mobile/$1 last;
}
}

location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$
{
fastcgi_hide_header Set-Cookie; #cookieless
expires 360d;
log_not_found off;
}


#Only for nginx-naxsi used with nginx-naxsi-ui : process denied requests
#location /RequestDenied {
# proxy_pass http://127.0.0.1:8080;
#}


##
# Rewriting
##


# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ \.php$ {
#try_files $uri =404; #nicola
fastcgi_split_path_info ^(.+\.php)(/.+)$;
# NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini

# # With php5-cgi alone:
# fastcgi_pass 127.0.0.1:9000;
# # With php5-fpm:
fastcgi_param SCRIPT_FILENAME /usr/share/nginx/www/mydomain$fastcgi_script_name;
fastcgi_param DOCUMENT_ROOT /usr/share/nginx/www/mydomain;
fastcgi_pass unix:/var/run/php5-fpm.sock;
fastcgi_index index.php;

fastcgi_buffer_size 128k;
fastcgi_buffers 256 16k;
fastcgi_busy_buffers_size 256k;
fastcgi_temp_file_write_size 256k;

include fastcgi_params;
}

# deny access to hidden files
#
location ~ /\.
{
log_not_found off;
deny all;
}
}

Naturally after each change i restart nginx service.
Where is my error? Can you help me about this?

Thanks and sorry for my poor english.