}
}

const redirectURL = "/thisaredirect细雪withasciilettersのけぶabcdefghijk.html"

func BenchmarkHexEscapeNonASCII(b *testing.B) {
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		hexEscapeNonASCII(redirectURL)
	}

func stringContainsCTLByte(s string) bool {
	for i := 0; i < len(s); i++ {
		b := s[i]
		if b < ' ' || b == 0x7f {
			return true
		}
	}
	return false
}

func hexEscapeNonASCII(s string) string {
	newLen := 0
	for i := 0; i < len(s); i++ {
		if s[i] >= utf8.RuneSelf {
			newLen += 3
		} else {
			newLen++
		}
	}
	if newLen == len(s) {
		return s
	}

	// the response because older user agents may not understand 301/307.
	// Do it only if the request didn't already have a Content-Type header.
	_, hadCT := h["Content-Type"]

	h.Set("Location", hexEscapeNonASCII(url))
	if !hadCT && (r.Method == "GET" || r.Method == "HEAD") {
		h.Set("Content-Type", "text/html; charset=utf-8")
	}
	w.WriteHeader(code)

	// Shouldn't send the body for POST or HEAD; that leaves GET.