const net/http.StatusUpgradeRequired

5 uses

	net/http (current package)
		status.go#L60: 	StatusUpgradeRequired              = 426 // RFC 9110, 15.5.22
		status.go#L175: 	case StatusUpgradeRequired:

	nhooyr.io/websocket
		accept.go#L164: 		return http.StatusUpgradeRequired, fmt.Errorf("WebSocket protocol violation: handshake request must be at least HTTP/1.1: %q", r.Proto)
		accept.go#L170: 		return http.StatusUpgradeRequired, fmt.Errorf("WebSocket protocol violation: Connection header %q does not contain Upgrade", r.Header.Get("Connection"))
		accept.go#L176: 		return http.StatusUpgradeRequired, fmt.Errorf("WebSocket protocol violation: Upgrade header %q does not contain websocket", r.Header.Get("Upgrade"))

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