I was on a ~20 hour ferry ship from Italy to Greece once. They had paid wifi using sattelite internet, which I did not want to pay. But for payments to work, they allowed access to stripe. Turns out, everything on stripe.com was accessible, even dev docs etc. So I started to waste their bandwidth by downloading gigabytes of images from the stripe website over and over again.
But that's quite unproductive. As it turned out, in order for stripe to work, it needs access to fastly CDN. And then I remembered that reddit also uses fastly. By connecting to stripe and changing the Host HTTP header to reddit.com, I could browse reddit! Images didn't work though (i.redd.it is not on fastly). I could edit my /etc/hosts and associate old.reddit.com with stripe's fastly IP address. After ignoring scary TLS errors, I could even log in.
But that's quite unproductive. As it turned out, in order for stripe to work, it needs access to fastly CDN. And then I remembered that reddit also uses fastly. By connecting to stripe and changing the Host HTTP header to reddit.com, I could browse reddit! Images didn't work though (i.redd.it is not on fastly). I could edit my /etc/hosts and associate old.reddit.com with stripe's fastly IP address. After ignoring scary TLS errors, I could even log in.