In python-dev I offered to make a patch to switch to https://self-signed.pythontest.net. Here is my patch so far.

There is one outstanding problem though: test_get_ca_certs_capath() fails. I think it is because the self-signed certificate does not have a “CA basic constraints” flag set, and SSLContext.get_ca_certs() no longer lists the certificate. Maybe someone else can help. I suspect this would need to be fixed on the server side (or find another server with a certificate signed with this flag set?), but I could easily be wrong :).