proxy/httpproxy/proxy.go
func NewReadonlyHandler(hdlr http.Handler) http.Handler {
	readonly := readonlyHandlerFunc(hdlr)
	return http.HandlerFunc(readonly)
}
func NewReadonlyHandler(hdlr http.Handler) http.Handler {
	readonly := readonlyHandlerFunc(hdlr)
	return http.HandlerFunc(readonly)
}
// NewReadonlyHandler wraps the given HTTP handler to allow only GET requests