Our plug-in supports linked mode by processing requests locally and forwarding to the other vCenters that are linked.
In the Flex web client, the url is something like: https://10.117.60.58:9443/vsphere-client/foo-war-4.2.0-SNAPSHOT/rest/abouts/local and it works.
In the HTML web client, the url is something like: https://10.117.60.58:9443/vsphere-ui/foo-war-4.2.0-SNAPSHOT/rest/abouts/local and it gets a HTTP 404.
Tough to support Linked Mode if we can't talk with the other vCenters.
Any ideas?