How deeply does Python Concurrency with asyncio cover WebSocket?

Explains persistent connections and implements endpoint callbacks, but does not descend into protocol internals.

WebSocket

As explained in Python Concurrency with asyncio

WebSocket is a network communication standard that provides a persistent, bidirectional connection between a client and server.

WebSocket replaces repeated HTTP polling with one persistent, bidirectional connection. The server can push updated data when it changes, avoiding requests that return nothing new. section 9.3.2

A practical WebSocket endpoint follows this lifecycle:

Accept a connection and add its socket to an in-memory client list. section 9.3.2
Send the current user count to connected clients whenever someone connects or disconnects. section 9.3.2
Remove disconnected clients and handle send failures so stale sockets do not remain. section 9.3.2

Live user count

A browser opens a WebSocket to a Starlette endpoint and updates the page from each incoming message. The server broadcasts the number of connected users without waiting for browser polls. section 9.3.2

How Python Concurrency with asyncio covers it

Cover of Python Concurrency with asyncio

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Also explained in

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Go in Practice, Second EditionWebSocket is a protocol that provides persistent, bidirectional communication between a client and server over a single connection.

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Related concepts

pollingalternative to · Polling is the repeated checking or querying of a resource, system, or condition, often at intervals, to detect data, events, or state changes.
Starletteused by · Starlette is a lightweight Python ASGI web framework and toolkit for building asynchronous web applications and services.
streaminguses · Streaming is the incremental handling of a sequence of data items, including their processing, transfer, or consumption as they become available.
server-sent eventsalternative to · Server-Sent Events is a web standard for streaming text-based event updates one way from a server to a client over an HTTP connection.
HTTPuses · HTTP is a standardized application-layer protocol that defines request-and-response messages for transferring resource representations between networked systems.

This explainer was generated by Manning's knowledge graph from the text of Python Concurrency with asyncio. The section links point to the parts of the book it draws on.