Intermittent 404s when requesting a CSS file

Hi,

Just installed nginx and I am also using php5-fpm on Ubuntu.

I created a very simple php page that has a css stylesheet reference at
the
top the of the generated HTML.

Every 2 or 3 requests however the browser request for the css file
returns a
404 (nginx 404). When that happens in the response headers I see:

X-Powered-By PHP/5.3.10-1ubuntu3.4

Which I think means that nginx sent the request to the php service
instead
of serving the css file itself.

Can someone help me figure out why this is happening? ( see below for my
nginx default.conf )

server {

listen       80;

server_name  localhost;

expires off;



#charset koi8-r;

#access_log  /var/log/nginx/log/host.access.log  main;



root /home/gustavo/nginx/html;



            location ~* /css/.*\.css$ {

                            add_header Content-Type text/css;

            }



            location ~ \.js {

                            add_header Content-Type

application/x-javascript;

            }



location / {

    #root   /usr/share/nginx/html;

            index  index.html index.htm;

}



#error_page  404              /404.html;





# 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/html;

            #root /usr/share/nginx/html;

}



# proxy the PHP scripts to Apache listening on 127.0.0.1:80

#

#location ~ \.php$ {

#    proxy_pass   http://127.0.0.1;

#}



# enforce NO www

if ($host ~* ^www\.(.*))

{

    set $host_without_www $1;

    rewrite ^/(.*)$ $scheme://$host_without_www/$1 permanent;

}

# canonicalize codeigniter url end points

# if your default controller is something other than "welcome" you

should change the following

if ($request_uri ~* ^(/welcome(/index)?|/index(.php)?)/?$)

{

    rewrite ^(.*)$ / permanent;

}

# removes trailing "index" from all controllers

if ($request_uri ~* index/?$)

{

    rewrite ^/(.*)/index/?$ /$1 permanent;

}

# removes trailing slashes (prevents SEO duplicate content issues)

if (!-d $request_filename)

{

    rewrite ^/(.+)/$ /$1 permanent;

}

# removes access to "system" folder, also allows a "System.php"

controller

if ($request_uri ~* ^/system)

{

    rewrite ^/(.*)$ /index.php?/$1 last;

    break;

}

# unless the request is for a valid file (image, js, css, etc.), 

send to
bootstrap

if (!-e $request_filename)

{

    rewrite ^/(.*)$ /index.php?/$1 last;

    break;

}





# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000

#

location ~ \.php$ {

            #root /home/gustavo/nginx/html;

            try_files $uri = 404;

            #fastcgi_split_path_info ^(.+\.php)(/.+)$;

    #fastcgi_pass   127.0.0.1:9000;

            fastcgi_pass unix:/var/run/php5-fpm.sock;

    fastcgi_index  index.php;

    include        fastcgi_params;

    fastcgi_param  SCRIPT_FILENAME 

$document_root$fastcgi_script_name;

}



# deny access to .htaccess files, if Apache's document root

# concurs with nginx's one

#

#location ~ /\.ht {

#    deny  all;

#}

}

Thanks