I am facing same issue, custom theme is not loaded when coming from SAP web Dispatcher ?
and the Fiori Launchpad content not displaying correctly ?
and the browser show a warn msg "load unsafe content" ?
and this "http://front-end-host:port" getting added infront of "/sap/puplic/bs/themes/..." when coming from web dispatcher ? why not "https://web-dispatcher-host:port" gets added instead ?
Please help.