The Heartbeat Extension for the Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) protocols was proposed as a standard in February 2012 by RFC 6520.
Rozszerzenie Heartbeat dla protokołów TLS (Transport Layer Security) i Datagram Transport Layer Security (DTLS) zaproponowano jako standard w lutym 2012 w dokumencie RFC 6520 ↓.