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This adds a --use-feature=truststore flag that, when specified on Python 3.10+ with
truststore
installed, switches pip to use truststore to provide HTTPS certificate validation, instead of certifi. This allows pip to verify certificates against custom certificates in the system store.truststore
is deliberately NOT vendored because it is expected the library to be under active development in the short term, and this prevents users having to wait for a pip release to get potentially vital bug fixes needed to be made in truststore.Supplying the use-feature flag without installing truststore beforehand, or on Python versions prior to 3.10, results in a command error.
See #11038 (and other issues linked there).