There is a proxy already running on vCenter - assuming this proxies the various services running on vCenter via the single port (TCP 443 - https):
Modify /sdk
changing the port to 28085
.
root@ip-172-31-250-99 [ /etc/vmware-rhttpproxy/endpoints.conf.d ]# cat vpxd-rhttpproxy-endpoint.conf
/sdk local 28085 redirect allow