SSE streaming

const res = await fetch("/api/adk/run_sse", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Authorization: `Bearer ${token}`,
  },
  body: JSON.stringify(payload),
});

const reader = res.body.getReader();
const decoder = new TextDecoder();

while (true) {
  const { done, value } = await reader.read();
  if (done) break;
  for (const line of decoder.decode(value).split("\n")) {
    if (line.startsWith("data: ")) {
      handle(JSON.parse(line.slice(6)));
    }
  }
}