# ZeroTest To set up a ZeroTest instance, simply set up a Web server to host `index.html` over an unencrypted HTTP connection. (ZeroTest will not work if loaded over HTTPS, because [restrictions on mixed content](https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content) will block its requests.) A public instance is available at [https://zerotest.kj7rrv.com/](https://zerotest.kj7rrv.com/); it uses the following Nginx configuration: ```nginx server { listen 80; listen [::]:80; server_name zerotest.kj7rrv.com; add_header Content-Security-Policy "connect-src 0.0.0.0:*;"; root /var/www/zerotest; charset utf-8; } server { listen 443; listen [::]:443; server_name zerotest.kj7rrv.com; return 301 http://zerotest.kj7rrv.com; include /etc/nginx/templates/ssl.tmpl; } ``` Note that if a [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) is set, it must allow `fetch` requests to all ports on `0.0.0.0`; the header in the example Nginx configuration (`connect-src 0.0.0.0:*;`) works well.