Experimental
Readonly
Every data: line's value, joined with \n (spec: multiple data: lines accumulate into one multi-line value).
data:
\n
The event: field's value, or "message" per spec default when omitted.
event:
"message"
Optional
The id: field's value, when the frame carried one. Replayed as Last-Event-ID on a stream reconnect.
id:
Last-Event-ID
Every
data:line's value, joined with\n(spec: multipledata:lines accumulate into one multi-line value).