Link to Flask static files with url_for

Question

How do you use url_for in Flask to reference a file in a folder? For example, I have some static files in the static folder, some of which may be

Answer 1

In my case I had special instruction into nginx configuration file:

location ~ \.(js|css|png|jpg|gif|swf|ico|pdf|mov|fla|zip|rar)$ {
            try_files $uri =404;
    }

All clients have received '404' because nginx nothing known about Flask.

I hope it help someone.