nginx (empty_gif) nginx

# ngx_http_empty_gif_module ships with standard nginx builds. empty_gif always
# serves nginx's own built-in 43-byte transparent 1x1 GIF; its bytes can't be
# changed (to serve your own GIF, use the static-file or njs variants).
server {
    listen 8080;

    location = /pixel.gif {
        empty_gif;
        add_header Cache-Control "no-store";
    }
}