The macOS locks port 80 for it's own use so you can't use it for any local web server apart from the provided Apache. There are some hacky ways for forwarding port 80 to another, like 8500:
The macOS locks port 80 for it's own use so you can't use it for any local web server apart from the provided Apache. There are some hacky ways for forwarding port 80 to another, like 8500: