node.js - I can't serve static by nginx -

i have following nodejs structure resides in /home/ubuntu/project directory:

 sever  site    |-css    |  |-styles.css    |-img    |  |-sprite.png    |-js      |-script.js 

i'm trying serve static assets nginx, wrote following location:

upstream myapp_upstream {     server 127.0.0.1:3000;     keepalive 64; }  server {     listen 80;      server_name www.myapp.com;      error_page 400 404 500 502 503 504 /50x.html;     location  /50x.html {             internal;             root /usr/share/nginx/www;     }      location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|robots.txt|humans.txt|favicon.ico|home/|html|xml) {         root /home/ubuntu/project/site;         access_log off;         expires max;     }      location / {         proxy_redirect off;         proxy_set_header   x-real-ip            $remote_addr;         proxy_set_header   x-forwarded-for  $proxy_add_x_forwarded_for;         proxy_set_header   x-forwarded-proto $scheme;         proxy_set_header   host                   $http_host;         proxy_set_header   x-nginx-proxy    true;         proxy_set_header   connection "";         proxy_http_version 1.1;         proxy_pass         http://myapp_upstream;         proxy_intercept_errors on;     } } 

but when try open site in browser failed status on requested assets. whet's problem?

edit: route css example is:

http://www.myapp.com/css/styles.css 

well,

add / root path.

root /usr/share/nginx/www; 

should

root /usr/share/nginx/www/; 

use alias assets like:

alias /home/ubuntu/project/site/; (again, add last /) 

these mess me:

location ~ ^/(images/|img/|javascript/|js/|css/|stylesheets/|flash/|media/|static/|robots.txt|humans.txt|favicon.ico|home/|html|xml) 

you should check these http://wiki.nginx.org/nginxhttpcoremodule#location

i dont see these folders images/, javascript/, stylesheets/, flash/, media/, static/ , home/ in sitemap.

and these both |html|xml looking route /html or /xml not .html or .xml files.

then try:

location ~ ^/(robots.txt|humans.txt) {     alias /home/ubuntu/project/site/;     access_log off;     expires max; }  location ~* \.(?:ico|css|js|gif|jpe?g|png)$ {  //add here file extensions needed.     alias /home/ubuntu/project/site/;     access_log off;     expires max;      }