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[1] RFC 6520 - Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) Heartbeat Extension ( 版) <http://tools.ietf.org/html/rfc6520>

[2] Transport Layer Security (TLS) Parameters ( 版) <http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#heartbeat-message-types>

[3] Transport Layer Security (TLS) Parameters ( 版) <http://www.iana.org/assignments/tls-parameters/tls-parameters.xhtml#heartbeat-modes>