https://localhost:443 becomes https://localhost

I launch a web application by sudo PORT=443 HTTPS=true ./node_modules/.bin/react-scripts start.

Then, I run https://localhost:443/#/start in a browser. It does open the start page, but the url becomes https://localhost/#/start.

Could anyone tell me why https://localhost:443/#/start becomes https://localhost/#/start?

PS: The browser is Chrome.