Hi,

I've setup nginx 1.10.3 on ubuntu 16.04.4 with client SSL certificates:

ssl_client_certificate /etc/nginx/client-cert/ca.crt;
ssl_verify_client optional;

I am not getting any prompts for the certificate in any browser.
What is the expected behavior of ssl_verify_client = optional? Do i still get a prompt or should i somehow force the browser to submit the certificate to the server?