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Re:The Guardian has moved to HTTPS by Ajedi32 on Tuesday November 29, 2016 @11:10AM (#13063911)
They usually work by MITMing your connection to whatever site you're trying to visit and serving an HTTP redirect (maybe 307?) to the captive portal page.

As a substitute for The Guardian, maybe try http://example.com?

Re:The Guardian has moved to HTTPS by andy_ppp on Tuesday November 29, 2016 @11:23AM (#13063996)
But eventually all the sites will be HTTPS - I've no idea what non-techy users do when faced with this apparent brokenness.
Re:The Guardian has moved to HTTPS by robin_reala on Tuesday November 29, 2016 @11:25AM (#13064011)
I’d be surprised if example.com goes https-only. Regardless, if all sites go https only then free wifi providers will have to come up with some other way of redirecting you to their signup page.