How to send ceritificate request with example/http3_server.py, and verify it with a CA

[ysy1111]

I am testing quic client sending certificate feature, I need a test server that would send certificate request to client, so my client can detect that request and send back the client certificate to server. I would upload a CA which signed my client cert to server side, I want server to use that CA to verify my client cert.

I saw there is a function called verify_certificate, which is only used by test files.