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由 Andy Wilkinson 提交于
Previously, there was no generic concept of a message that represents a heartbeat and the STOMP-specific code used a null STOMP command to represent a heartbeat. This commit introduces HEARTBEAT as a new SimpMessageType. The STOMP support has been updated to create HEARTBEAT messages to represent heartbeats, and to use the new message type as the mechanism by which heartbeats are identified.
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