How to access conf/html/index.html file via

OpenHAB Version - 2.3.0
I am trying to access simple static file via openhab cloud(myopenhab) but unable to access it.

Here is my sitemap file
sitemap demo label=“Main Menu”
Frame label= “Ethernet”

		Text item=Tmp_eth
		Text item=Hum_eth
		Switch item=Light_Bulb							
		Text item=mq135_eth
		Webview url="" height=5
} is not a general purpose web proxy. It only proxies openHAB’s REST API, nothing more. To access that Webview outside of your LAN, you’ll need to expose it to the Internet and use a publicly accessible URL.

Obviously this is very risk and should only be considered if you know what you are doing.