Nginx proxy pass

proxy-pass

upstream somewhere
{
	server localhost:4000;
}

server
{
	location /
	{
		try_files $uri @proxy;
	}
	
	location @proxy
	{
		proxy_pass http://somewhere;
		proxy_http_version 1.1;
		proxy_set_header X-Forwarded-For $remote_addr;
	}
	
	location /or/a/specific/path
        {
                proxy_pass http://www.somewhere-else.com/file.js;
                expires 1w;
                break;
        }
}