Yes, you can do that given that there is no HTTPS service running on port 443. Format of the URL to access will be as below.
HTTP://xyz.com:443 - It is using HTTP protocol with custom port 443.
You can run any protocol on any port you wish, as long as the server and the client are actually configured to use the same port. You can technically run HTTPS over 80 if you wish, you would just have to specify https://<server>:80 since the browser will make an assumption that all https traffic would be going to port 443.
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