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Last time I checked Socket.IO doesn't support GZip compression. I found that, especially on mobile connections with larger datasets, it's just faster to use AJAX requests for client->server data requests, in combination with Socket.IO for fast server->client updates/notifications.

It does in fact support gzip ( see: https://github.com/LearnBoost/socket.io/wiki/Configuring-Soc... ), but there's an outstanding issue with spawning the gzip process ( see: https://github.com/LearnBoost/socket.io/issues/932#issuecomm... ).

This should be fixed in the upcoming update to zlib.


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