neverssl.com uses JavaScript to redirect you to a random subdomain. This works around poorly behaved caches. It also (as the link discusses) redirects https to

neverssl.com uses JavaScript to redirect you to a random subdomain. This works around poorly behaved caches. It also (as the link discusses) redirects https to http. It's poorly named. It's narrowly tailored at helping potentially non-technical users work around poorly implemented captive portals.