StatusNotModified       = 304 // RFC 9110, 15.4.5
	StatusUseProxy          = 305 // RFC 9110, 15.4.6
	_                       = 306 // RFC 9110, 15.4.7 (Unused)
	StatusTemporaryRedirect = 307 // RFC 9110, 15.4.8
	StatusPermanentRedirect = 308 // RFC 9110, 15.4.9

	StatusBadRequest                   = 400 // RFC 9110, 15.5.1
	StatusUnauthorized                 = 401 // RFC 9110, 15.5.2
	StatusPaymentRequired              = 402 // RFC 9110, 15.5.3

			health:  probe.Failure,
		},
		{
			handler: redirectHandler(http.StatusPermanentRedirect, false), // 308
			health:  probe.Success,
		},
		{
			handler: redirectHandler(http.StatusPermanentRedirect, true), // 308
			health:  probe.Failure,
		},
		{
			handler: redirectHandlerWithBody(http.StatusPermanentRedirect, ""), // redirect with empty body
			health:  probe.Warning,

pkg net/http, const StatusMultiStatus ideal-int
pkg net/http, const StatusNotExtended = 510
pkg net/http, const StatusNotExtended ideal-int
pkg net/http, const StatusPermanentRedirect = 308
pkg net/http, const StatusPermanentRedirect ideal-int
pkg net/http, const StatusProcessing = 102
pkg net/http, const StatusProcessing ideal-int
pkg net/http, const StatusUnprocessableEntity = 422

	"Use Proxy":                       http.StatusUseProxy,
	"Temporary Redirect":              http.StatusTemporaryRedirect,
	"Permanent Redirect":              http.StatusPermanentRedirect,
	"Bad Request":                     http.StatusBadRequest,
	"Unauthorized":                    http.StatusUnauthorized,
	"Payment Required":                http.StatusPaymentRequired,

	for _, statusCode := range []int{
		http.StatusMovedPermanently,  // 301
		http.StatusFound,             // 302
		http.StatusSeeOther,          // 303
		http.StatusTemporaryRedirect, // 307
		http.StatusPermanentRedirect, // 308
	} {
		// Create upstream fake SPDY server which returns a redirect.
		spdyServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
			w.Header().Set("Location", "/")

		{"StatusNotImplemented", Const, 0},
		{"StatusNotModified", Const, 0},
		{"StatusOK", Const, 0},
		{"StatusPartialContent", Const, 0},
		{"StatusPaymentRequired", Const, 0},
		{"StatusPermanentRedirect", Const, 7},
		{"StatusPreconditionFailed", Const, 0},
		{"StatusPreconditionRequired", Const, 6},
		{"StatusProcessing", Const, 7},
		{"StatusProxyAuthRequired", Const, 0},