Django 1.4.1: serving static and media with custom nginx build

server {
    listen   MY_PORT;
    server_name USERNAME.webfactional.com;

    access_log /home/USERNAME/logs/user/nginx/app_access.log;
    error_log  /home/USERNAME/logs/user/nginx/app_error.log;

    root /home/USERNAME/.virtualenvs/medialaw;

   location /m {
        alias /home/USERNAME/media/app/media;

        if ($query_string) {
            expires max;
        }
    }

    location /s {
        alias /home/imanhodjaev/media/app/static;

        if ($query_string) {
            expires max;
         }
    }

    location / {
        proxy_pass_header Server;
        proxy_set_header Host $http_host;
        proxy_redirect off;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Scheme $scheme;
        proxy_connect_timeout 10;
        proxy_read_timeout 10;
        proxy_pass http://localhost:PORT/;
    }

    error_page 500 502 503 504 /media/50x.html;
}