SSE concepts

There are some concepts we need to understand before we can start building our server. First off, a server using SSE as transport is a server that can be accessed via HTTP. That means, even if it can run locally, it can also be accessed remotely. The implications of this are that this is a server that we need to expose using a web server.

SSE is a standard for unidirectional communication from server to client over a single, long-lived HTTP connection. It allows servers to push real-time updates to clients without requiring the client to poll for changes. Here are some more details:

• Protocol: SSE uses standard HTTP with the MIME type text/event-stream
• Client API: The browser uses the EventSource API to receive events
• Format: Messages are sent as plain text with fields such as event, data, and id, each terminated by two endlines

It’s typically used for dashboard-like applications where real-time updates are crucial.

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