[phicoh]

On POSIX systems (including MacOS), just 'fe80::1' doesn't work. You need something like fe80::1%eth0. The 'eth0' is in general unknown, because it is the name of the outgoing interface, which varies from OS to OS and even between Linux distributions.

Then in URLs you have the question whether it is 'http://[fe80::1%eth0]' or 'http://[fe80::1%25eth0]' ('%'s escaping). And by and large browsers have decided that the whole '%eth0' is complex from a security point of view, so they don't support it.

In some cases Windows does allow just a 'fe80::1'. But I don't know under what circumstances.