I wanted to use Netflix' go-jira CLI with a JIRA service protected by mutual SSL authentication. This project allows this by creating a UNIX pipe which go-jira / JIRA can interface with.
Install this with Homebrew!
$ brew tap kieran-bamforth/repo
$ brew install client-cert-proxy
The service proxy is now available:
$ brew services list
The socket is created at /usr/local/var/client-cert-proxy.sock—point your proxied traffic at it!