Very good find

I will for sure not be able to detect a landing page automatically.
But do we (really) need that convenience functionality? If we need to log in on a landing page we will be directed by first using the browser (or we will know that already by location!).

It would be nice if you set up this small http service and I might think about using it.
But I also would like to keep it locally. Not spreading out info where my device is located at which time (only a bit privacy paranoid not as much as not using the www). If I would have known that earlier ...

Made a daemon running socat on localhost with required response.
Disclaimer: all done on Open Mode kernel!

Untar to /. Or put socat (executable) to /usr/bin and connectivity*.conf to /etc/init/apps. And start daemon with /sbin/initctl start apps/custom-fake-connectivity-test.
Oh, and ofc add
127.0.0.1 connectivity-test.ext.nokia.com
to /etc/hosts.