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So that clients in HTTP long-polling can decide how many packets they
have to send to stay under the maxHttpBufferSize value.
This is a backward compatible change which should not mandate a new
major revision of the protocol (we stay in v4), as we only add a field
in the JSON-encoded handshake data:
```
0{"sid":"lv_VI97HAXpY6yYWAAAC","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":5000,"maxPayload":1000000}
```
Related: https://github.com/socketio/socket.io-client/issues/1531