Mark Brown looks at persistent connections between client/server via WebSockets & server-sent events. He also examines re-connection & state reconciliation.

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Learn how to build real-time apps using WebSockets and Server-Sent Events. Understand the differences between WebSockets and HTTP in terms of performance and functionality. Find out how to implement WebSockets in an Android application. Explore common use cases for WebSockets and Server-Sent Events.

Building Real-time Apps with Websockets & Server-Sent Events — SitePoint

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