HTTP ロング ポーリング
Socket.IO is not meant to be used in a background service for mobile applications.
high battery drain for your users.
HTTP long-polling in case the WebSocket connection cannot be established
That's why Socket.IO includes a heartbeat mechanism, which periodically checks the status of the connection
unaware of the broken state of the link
And when the client eventually gets disconnected, it automatically reconnects with an exponential back-off delay, in order not to overwhelm the server.
The packets are automatically buffered when the client is disconnected, and will be sent upon reconnection.
send an event and receive a response
send an event to all connected clients or to a subset of clients
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