https:// URLs through an HTTP proxy, which is what browsers and most tools do by default. The protocol setting describes how your tool talks to the proxy, not what it can fetch.
The default ports are 8080 for HTTP and 1080 for SOCKS5. Alternative SOCKS5 ports such as 1081 are also available.
For the full port list and how to set the protocol in your proxy string, see Protocols and ports.