The local hubaction is limited because it is not doing the request in the cloud. The hub has a very limited ability (why? who knows, but originally I’m sure it thought everything would just happen in the cloud, then sonos and hue happened)…
I’ve been yelling for this support for over a year, now that hub v2 is here, it seems like at least at launch, things are no more improved…
httpPost and httpGet are done in the cloud not on the hub. It doesn’t run locally. try doing a request to get your public IP using httpGet/Post and you will not get your ISP provided public ip, you will get a cloud server’s ip.
Maybe someday this functionally locally will be expanded, but I haven’t seen anything that suggests it will get better anytime soon. Hacks and workarounds…