nginx

upstream staticcontent {
  server myserv-1.local;
  server myserv-2.local;
}

server {
      
       location ~* \.(ico|js|css|png|gif|jpe?g|swf|txt|html?|htc)$ {
		            expires 7d;
		            proxy_next_upstream error timeout invalid_header http_500 updating;
		            proxy_cache_valid 200 7d;
                proxy_set_header Host $host;
                proxy_pass http://staticcontent;
	}

}