Captive Portal: Provide better UX?

[guruz]

With a captive portal which

• Triggers "Connection closed" for HTTPS
• Does a forward to the portal for HTTP

Is there anything better we could do than displaying "Connection closed"?
Note that sometimes with this captive portal we also saw the SSL cert acceptance dialog, but not always..

guruz@mac ~ $ openssl  s_client -connect cloud.example.com:443
CONNECTED(00000003)
64610:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:/SourceCache/OpenSSL098/OpenSSL098-52.40.1/src/ssl/s23_lib.c:185:
guruz@mac ~ $

FYI @danimo

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[unhammer]

Here's Android's implementation: http://stackoverflow.com/questions/13958614/how-to-check-for-unrestricted-internet-access-captive-portal-detection#14030276
And Firefox's bug report with interesting considerations: https://bugzilla.mozilla.org/show_bug.cgi?id=562917
Perhaps the Owncloud server could have a /generate_204 endpoint?

[guruz]

Noticed this is a dup of #3120
Keeping open because it contains info too..