ProxyFromEnvironment does not work as expected

[terrorbyte]

As per the debugging session in chat the -proxy handling does not work as expected under some conditions. This for example works in httphelpers.go but not the ProxyFromEnvironment:

Proxy: http.ProxyURL(&url.URL{
	Scheme: "http",
	Host:   "127.0.0.1:8081",
}),```