There's already an option to validate server TLS certificate using `lua_ssl_trusted_certificate`. It would be nice if we could provide client TLS certificate, in the same way as `ngx_http_proxy` module is doing: http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_ssl_certificate, so that there would be two new options: - `lua_ssl_certificate` - `lua_ssl_certificate_key` These options would initialise nginx ssl context with client certificates, which would be used during ssl handshake.