NewSingleEndpointReverseProxy - Based on the Std Lib NewSingleHostReverseProxy https://golang.org/src/net/http/httputil/reverseproxy.go?s=2588:2649#L80.

NewSingleEndpointSameHostReverseProxyHandler wraps the ReverseProxy generated by `NewSingleEndpointReverseProxy` with the `sameHostHandler` to rewrite the Host param of the Request to the target (for more info see `sameHostHandler`).