Cast Unable to connect to the Home Assistant websocket API

Home Assistant release with the issue: version: 0.99.2

Last working Home Assistant release (if known): None

Operating environment (Hass.io/Docker/Windows/etc.): Hass.io

arch: amd64
boot: true
custom: false
image: homeassistant/qemux86-64-homeassistant
machine: qemux86-64

Component/platform: Cast

Description of problem: When using the cast website interactively - casting lovelace cards works. When using cast.show_lovelace_view the chromecasts display the HA logo ❤️Nabu Casa Logo with an error below reading: Not Connected Error: Unable to connect to the Home Assistant websocket API.

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

websocket_api:

Working when called via gui

Not working when called via cast.show_lovelace_view

[stale[bot]]

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[BenWoodford]

I resolved this by setting the private IP on my public DNS for the domain (as I use a subdomain for local stuff)

Really we do need the ability to override the URL used for Casting though