The new --set-trusted-host option needs a new devpi-common release. Because we dropped Python 2.6 support in devpi-common, we would either have to backport the changes to devpi-common 2.x, or drop support of Python 2.6 for devpi-client.

I vote for dropping Python 2.6 support. Soon pip will stop supporting it and that will mean it will become even harder to test with Python 2.6. Anyone who still needs Python 2.6 support should use an older devpi-client release. All other devpi packages dropped Python 2.6 already.

Kill 2.6 with 🔥 https://github.com/pypa/pip/pull/4343 https://github.com/pypa/pip/pull/4343 (unless someone pays you for catering to an outdated and unsupported platform).