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Does PubNub use WebSockets and / or XMPP under the hood?

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WebSockets: There is support for WebSockets ( http://www.pubnub.com/websockets/ ) and socket.io, however do other SDKs use web sockets?

XMPP: Does PubNub Use It as a Communication Protocol?

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PubNub WebSockets and / or XMPP

Update 2019 🌟 PubNub plans to add additional protocols. MQTTsupported today, in addition, we will add WebSocketsand SEEand push-connection without establishing a connection to UDP.

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PubNub , WebSockets, MQTT, COMET, BOSH, , SPDY, HTTP 2.0 . , PubNub , .

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