gistfile1.txt

server {
        root /usr/share/nginx/www;
        index index.html index.htm;

        server_name localhost;

        location ~ ^/proxy/([0-9a-z]*)/$ {
                error_page 404 = @try_slow_path;
                proxy_intercept_errors on;
                proxy_pass http://localhost:8000;                                                                                                                             
        }

        location @try_slow_path {
                proxy_pass http://localhost:8001;                                                                                                                             
        }
}