rest/route.go
func Head(pathExp string, handlerFunc HandlerFunc) *Route {
	return &Route{
		HttpMethod: "HEAD",
		PathExp:    pathExp,
		Func:       handlerFunc,
	}
}
func Head(pathExp string, handlerFunc HandlerFunc) *Route {
	return &Route{
		HttpMethod: "HEAD",
		PathExp:    pathExp,
		Func:       handlerFunc,
	}
}
// Head is a shortcut method that instantiates a HEAD route. See the Route object the parameters definitions.
// Equivalent to &Route{"HEAD", pathExp, handlerFunc}