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Standard SSE is text-based. For binary streams (e.g. application/octet-stream), Tonbo Stream wraps each SSE data event in a JSON envelope with base64 encoding: 
{
  "encoding": "base64",
  "contentType": "application/octet-stream",
  "payload": "aGVsbG8="
}
This lets binary streams use the same SSE live-tailing path as text streams, so browser EventSource works regardless of content type.