I'm trying to get a client to present its certificate when it hits the first request to my server

e.g. http://localhost/run

I want undertow to "ask" for  client certificate.

I have an undertow server with an https listener and valid sslcontext with trust and keystore. What steps are required to get a client to present the certificate. Does any one have a basic hello world example?

I've tried to get hints from DefaultServer but maybe this is too much detail for what I need and I can't find a good example in the docs.

Thanks in advance,

Devl