ngx_ssl_verify_error_optional 1853 src/http/ngx_http_request.c                 && (sscf->verify != 3 || !ngx_ssl_verify_error_optional(rc)))
ngx_ssl_verify_error_optional  299 src/mail/ngx_mail_handler.c         && (sslcf->verify != 3 || !ngx_ssl_verify_error_optional(rc)))