wss: make it more reliable by using subprotocols with ack #362
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If no subprotocol specified, message recived from websocket just have data field.
If we specified the subprotocol to
json.reliable.webpubsub.azure.v1
, the message will be attached with sequence id,so we can send ack to server periodicly.I guess in this case, the message will not be send agian after we send the ack message to server.