In hotels or at airports, connection to the public WiFi requires you to start a browser session, which is then redirected to some log-in page. Due to security concerns, browsers now pop up warnings about such redirection, and if you're on a company laptop, you may not be able to proceed. Also, any HTTPS site won't allow redirect in the first place, and more and more websites start implementing HTTPS.
Is there a reliable way to get to the login page for a public WiFi network that doesn't require hoping you know a site that's still on HTTP, or even better, that won't be blocked by overzealous company security?