mythweb not working with master backend on IPV6

[TownCube]

• Platform: Linux localhost 5.13.12-200.fc34.x86_64 # 1 SMP Wed Aug 18 13:27:18 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

• MythTV version: fixes/31

• Package version: Fedora 19.158.20210629git0680b37c68.fc34

• Component: mythweb

What steps will reproduce the bug?

1. Stop backend
2. In mythtv-setup, set master backend address to an IPV6 address (I tried both loopback and link local from the drop down)
3. Start backend
4. Open mythweb and the errors below will appear

How often does it reproduce? Is there a required condition?

Everytime

What is the expected behaviour?

Mythweb connects to backend

What do you see instead?

Mythweb reports it can not connect:

Error

Unable to connect to the master backend at ::1:6543.
Is it running?

Error

Unable to connect to the master backend at [fe80::xxxx:xxxx:xxxx:xxxx]:6543 (hostname: fe80::::xxxx:xxxx:xxxx:xxxx).
Is it running?

Additional information