StatusPreconditionRequired         = 428 // RFC 6585, 3
	StatusTooManyRequests              = 429 // RFC 6585, 4
	StatusRequestHeaderFieldsTooLarge  = 431 // RFC 6585, 5
	StatusUnavailableForLegalReasons   = 451 // RFC 7725, 3

	StatusInternalServerError           = 500 // RFC 9110, 15.6.1
	StatusNotImplemented                = 501 // RFC 9110, 15.6.2
	StatusBadGateway                    = 502 // RFC 9110, 15.6.3

pkg net/http, const StatusRequestHeaderFieldsTooLarge ideal-int
pkg net/http, const StatusTooManyRequests = 429
pkg net/http, const StatusTooManyRequests ideal-int
pkg net/http, const StatusUnavailableForLegalReasons = 451
pkg net/http, const StatusUnavailableForLegalReasons ideal-int
pkg net/http, type Transport struct, ExpectContinueTimeout time.Duration
pkg net/http, type Transport struct, TLSNextProto map[string]func(string, *tls.Conn) RoundTripper

	"Too Many Requests":               http.StatusTooManyRequests,
	"Request Header Fields Too Large": http.StatusRequestHeaderFieldsTooLarge,
	"Unavailable For Legal Reasons":   http.StatusUnavailableForLegalReasons,
	"Internal Server Error":           http.StatusInternalServerError,
	"Not Implemented":                 http.StatusNotImplemented,
	"Bad Gateway":                     http.StatusBadGateway,

		{"StatusTemporaryRedirect", Const, 0},
		{"StatusText", Func, 0},
		{"StatusTooEarly", Const, 12},
		{"StatusTooManyRequests", Const, 6},
		{"StatusUnauthorized", Const, 0},
		{"StatusUnavailableForLegalReasons", Const, 6},
		{"StatusUnprocessableEntity", Const, 7},
		{"StatusUnsupportedMediaType", Const, 0},
		{"StatusUpgradeRequired", Const, 7},
		{"StatusUseProxy", Const, 0},