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We do need HTTP because sometimes public WiFi networks need you to agree to terms before any requests stop being redirected. I recently found http://neverssl.com

That being said those public WiFi’s shouldn’t be redirecting sites in the first place because for HTTPs sites browsers don’t even let you see the page.

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There's things like detectportal.firefox.com, which is used by Firefox to detect whether a captive portal is in effect.

http://http.rip

I personally prefer http://example.com as is it is explicitly http-only, adminitred by IANA.

It boggles my mind that we haven't yet agreed on a signaling mechanism at the AP level (DHCP?) for signaling captive portals, as this seems to be quite a common use-case.

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