w.Header().Set("Upgrade", "foo")
		w.Header().Set(fakeHopHeader, "foo")
		w.Header().Add("X-Multi-Value", "foo")
		w.Header().Add("X-Multi-Value", "bar")
		http.SetCookie(w, &http.Cookie{Name: "flavor", Value: "chocolateChip"})
		w.WriteHeader(backendStatus)
		w.Write([]byte(backendResponse))
		w.Header().Set("X-Trailer", "trailer_value")
		w.Header().Set(http.TrailerPrefix+"X-Unannounced-Trailer", "unannounced_trailer_value")
	}))

	}
	if got := res.Header.Get("Location"); got != fakeURL {
		t.Errorf("Location header = %q; want %q", got, fakeURL)
	}
}

var expectedCookies = []*Cookie{
	{Name: "ChocolateChip", Value: "tasty"},
	{Name: "First", Value: "Hit"},
	{Name: "Second", Value: "Hit"},
}

var echoCookiesRedirectHandler = HandlerFunc(func(w ResponseWriter, r *Request) {
	for _, cookie := range r.Cookies() {