=== GET /sse/raw : raw bytes, one line per row ===
| HTTP/1.1 200 
| Content-Type: text/event-stream
| Transfer-Encoding: chunked
| Date: Thu, 03 Sep 2026 18:59:33 GMT
| Connection: close
| 
| ac
| :stream open
| 
| id:1
| event:metric
| retry:3000
| data:{"seq":1,"host":"node-a","cpu":0.42,"heapMb":512,"at":"2026-09-03T10:00:00Z"}
| 
| id:2
| event:note
| data:line one
| data:line two
| 
| 
| 0