chain.go
func (mws Middlewares) HandlerFunc(h http.HandlerFunc) http.Handler {
	return &ChainHandler{mws, h, chain(mws, h)}
}
func (mws Middlewares) HandlerFunc(h http.HandlerFunc) http.Handler {
	return &ChainHandler{mws, h, chain(mws, h)}
}
func ( mws Middlewares ) HandlerFunc ( h http . HandlerFunc ) http . Handler { return & ChainHandler { mws , h , chain ( mws , h ) } }
// HandlerFunc builds and returns a http.Handler from the chain of middlewares,
// with `h http.Handler` as the final handler.
HandlerFunc builds and returns a http . Handler from the chain of middlewares with h http . Handler as the final handler .