Nginx Setting expires headers cause 404

i'm using nginx as reverse proxy. I'm already redirect port 80 to 8080, redirect non-www to www and enabled gzip. Al this works.

Now i need add expires headers

Following many posts and answers to this question i add

location ~* \.(ico|css|js|gif|jpeg|jpg|png|woff|ttf|otf|svg|woff2|eot)$ {
    expires 30d;
    add_header Pragma public;
    add_header Cache-Control "public";
}

But when i restart nginx, all my static files, that matches with location cannot but found.

I tried figure out by my self but without success.

Follow my default.com

proxy_cache_path /tmp/nginx levels=1:2 keys_zone=nginx_cache_zone:10m inactive=60m;
proxy_cache_key "$scheme$request_method$host$request_uri";

upstream originserver  {
  server 127.0.0.1:8080;
}

server {
  server_name  mysite.com;
  rewrite ^(.*) $scheme://www.mysite.com$1 permanent;
}

server {

  listen 80;
  server_name www.mysite.com;  

  location /{
    try_files $uri @backend;
  }

  location @backend {
    proxy_pass  http://originserver;
    proxy_set_header Host $host;
    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;
  }

  location ~* \.(ico|css|js|gif|jpeg|jpg|png|woff|ttf|otf|svg|woff2|eot)$ {
    expires 30d;
    add_header Pragma public;
    add_header Cache-Control "public";
  }

}

How can i fix it?

Thanks