Produced by OmniGraffle 6.6.2 2018-07-29 15:25:34 +0000Canvas 1Layer 1CONNECTINGOPENCLOSINGCLOSEDtransfer_dataclose_connectionconnectrecv / send / ping / pong / close opening handshakeconnectionterminationdata transfer& closing handshakekeepalive_ping