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

Question

I have the following nodejs structure which is resides in /home/ubuntu/project directory:
sever
site
|-css
| |-styles.css
|-img
| |-sprite.png
|-js
|-script.js
I'm trying to serve static assets by nginx, so I wrote the 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 I try to open up my site in a browser I get failed status on all requested assets. Whet's the problem?
EDIT:
My route to css for example is:
http://www.myapp.com/css/styles.css

Answer 1

Well,
Add a / to the root path.
root /usr/share/nginx/www;
should be
root /usr/share/nginx/www/;
Use an alias for the assets like:
alias /home/ubuntu/project/site/; (again, add the last /)
These is a mess for 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/ and home/ in your sitemap.
And these both |html|xml are looking for the route /html or /xml not the .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 all the file extensions needed.
alias /home/ubuntu/project/site/;
access_log off;
expires max;
}