Hi Bin,
Apps Manager will provide HTTPS link for system and the default domain. For Shared Domains it will provide HTTP links.
There is a checkbox "Disable HTTP on HAProxy and Gorouter" in the Networking section of the PAS tile.
- https://docs.pivotal.io/pivotalcf/2-2/customizing/config-er-vmware.html
This parameter disables the Gorouter and HAproxy from accepting HTTP requests.
And it also forces Apps Manager to display all URLs as HTTPS.
This assumes you want to completely disable HTTP traffic and only allow HTTPS. I would recommend testing this in dev environment first just in case you see any unexpected behavior.
Kind regards,
Stephen