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feat: add the ability to test all transports
When setting the `tryAllTransports` option to `true`, if the first transport (usually, HTTP long-polling) fails, then the other transports will be tested too. This is useful in two cases: > when HTTP long-polling is disabled on the server, or if CORS fails Related: - https://github.com/socketio/engine.io-client/issues/575 - https://github.com/socketio/socket.io-client/issues/1448 > when WebSocket is tested first (`transports: ["websocket", "polling"]) Related: - https://github.com/socketio/engine.io-client/issues/714 - https://github.com/socketio/socket.io-client/issues/1599 The only potential downside is that the connection attempt could take more time in case of failure, as there have been reports of WebSocket connection errors taking several seconds before being detected (that's one reason for using HTTP long-polling first). That's why the option defaults to `false` for now.
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