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socket.io-client-swift libs version <=15.2.0, which uses protocol version 3, do not explicitly add the EIO query parameter at transport initialization. This omission leads the server to treat the client as a client that supports the protocol version 4, previously set as default, which is not correct for those versions of the client lib. From socket.io-client-swift version v16.0.0 the EIO query parameter is explicitly passed to specify the protocol version supported, but since the allowEIO3 parameter aims to make the server compatible with previous versions which in most of the cases are already used in production and not easily upgradable, it makes more sense to default the EIO version to 3 if not explicitly set by the client since the newer client versions pass the EIO protocol version in query parameters. Related: https://github.com/socketio/socket.io/issues/3794