Self signed SSL with https_proxy

Hi - I'm attempting to use http_proxy and https_proxy in linux. I've set both variables as such

export http_proxy=http://some_ip:8080/ 

export https_proxy=https://some_ip:8080/

The HTTP proxy looks to be working fine, I'm having issues with the https proxy however. I'm using a self signed cert. Which I've added to /etc/ssl/certs and executed c_rehash but that seems to do nothing?

How do I trust the https proxy? Do I need to add the cert somewhere or is there an enviornment variable that needs to be set for this to work? This is on photonos but I'm having the same issue testing this on other envs such as ubuntu and centos.

Thank you