alt Hacker NewsThey probably know what it is but are just not familiar with the term.
I find the OS' captive portal detection to sometimes be flaky, so I often just directly visit www.neverssl.com to reliably trigger the captive portal redirect.
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Helithumper • today at 4:59 AM
also http://captive.apple.com and sometimes I'll do http://lobste.rs.
I used to use neverssl, but it's very different for .org and .com and I kept forgetting which was which.
This post reminded me to make a siri shortcut that just opens safari to http://captive.apple.com to trigger the captive portal.
The basic workflow at Gateway side is inspecting all HTTP port 80 traffic (with iptables or others), If the URL is about internet detection, reply a 301 redirect to the captive portal URL.
But the URL is too complex among different vendor:
https://captivebehavior.wballiance.com/
I don't know why, even I tracked the URLs, sometimes it still fails (OS refuse connecting to the URL?).
DHCP option 114 (RFC8908) can advertise the URL to client directly, but it is not widely supported:
https://developer.apple.com/news/?id=q78sq5rv