DocumentationPart III: Messaging, Notifications & Real-Time CommunicationChapter 8: Real-Time Communication & Notification SystemsChapter 8 ReferencesChapter 8 ReferencesBooks High Performance Browser Networking by Ilya Grigorik.Kafka: The Definitive Guide by Gwen Shapira, Neha Narkhede, Todd Nirschl, and Arjun Srikantan.Site Reliability Engineering by Betsy Beyer, Chris Jones, Jennifer Petoff, and Niall Richard Murphy.Websites RFC 6455: The WebSocket ProtocolWHATWG HTML: Server-sent eventsMDN: Server-sent eventsRedis documentation: Key expirationApache Kafka documentationApple Developer: User notificationsFirebase documentation: Cloud MessagingScalable Real-Time Chat & Collaboration Systems Architecture