debugpy on Fly.io IPV4 IPV6 (workaround for vs-code)

Python
1

Hi all,
Just reporting a workaround to using vs-code and debugpy on fly.io after much head-scratching trying to establish a connection.

RuntimeError: Can't listen for client connections: [Errno -9] Address family for hostname not supported

Background: Fly.io only routes IPV6 to its containers. debugpy only accepts IPV4.

More fully documented here: [Feature request] Support connect to ipv6 address · Issue #1252 · microsoft/debugpy · GitHub

debugpy does not support IPV6. Fly.io only supports IPV6.

The solution shown (and installed here) uses:

  1. fly proxy tunnelling between your dev machine and the remote container running your app

  2. bridges 6tunnel running on the remote container tunnelling between the inbound IPV6 traffic to the Python IPV4-only version of debugpy.

I suggest this workaround is added to fly.io documentation base.

Thanks, Martin