Detailed Description

Layer 5 (Session) - opening and closing an event stream.

RFC 4254 sec 5 states the shape a multiplexed stream takes: a side that opens "allocates a local number for the channel", and a party "may then reuse the channel number" once it is closed. Sequencing that open and that close is this layer's.

RFC 9293 sec 3.6 MUST-12 is why the close is one call rather than each caller's checklist: "If the local TCP connection is closed by the remote side due to a FIN or RST received from the remote side, then the local application MUST be informed whether it closed normally or was aborted."

Author: Douglas Quigg (dstroy0)

Date: 2026

Definition in file sse.h.