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|Original author(s)||Guillermo Rauch|
2.3.0 / September 20, 2019
Socket.IO primarily uses the WebSocket protocol with polling as a fallback option, while providing the same interface. Although it can be used as simply a wrapper for WebSocket, it provides many more features, including broadcasting to multiple sockets, storing data associated with each client, and asynchronous I/O.
Socket.IO handles the connection transparently. It will automatically upgrade to WebSocket if possible. This requires the programmer to only have Socket.IO knowledge.
Socket.IO is not a WebSocket library with fallback options to other realtime protocols. It is a custom realtime transport protocol implementation on top of other realtime protocols. A Socket.IO implementing server cannot connect to a non-Socket.IO WebSocket client. A Socket.IO implementing client cannot talk to a non-Socket.IO WebSocket or Long Polling Comet server. Socket.IO requires using the Socket.IO libraries on both client and server side.
- "Release 2.3.0 · socketio/socket.io". GitHub.
- "socket.io/LICENSE at master · socketio/socket.io · GitHub". GitHub.
- "socketio/engine.io". GitHub.
- "socket.io". npmjs.org.
- "faq - npm Documentation". npmjs.com. Archived from the original on 2015-11-25.
- Damien Arrachequesne (13 May 2017). "Socket.IO 2.0.0 release post".
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