我在opnai的文档中看到对stream: true的描述

stream: true
If set, partial message deltas will be sent, like in ChatGPT. Tokens will be sent as data-only server-sent events as they become available, with the stream terminated by a data: [DONE] message. Example Python code.

这里使用了server-sent events，我查看了server-sent events的MDN文档，文档对server-sent events的使用说明是这样的，但是在课程的代码中没有看到类似的处理。

// 处理server-sent events
const evtSource = new EventSource(url)
evtSource.addEventlisenter('event', callback)

但是我不明白使用fetch请求的body是如何接收server-sent events的，我知道Response.body本身就是一个ReadableStream对象，例如下面这段代码：

fetch('https://www.example.org')
  .then((response) => response.body)
  .then((rb) => {
    const reader = rb.getReader();
    return new ReadableStream({
      start(controller) {
        // The following function handles each data chunk
        function push() {
          // "done" is a Boolean and value a "Uint8Array"
          reader.read().then(({ done, value }) => {
            // If there is no more data to read
            if (done) {
              console.log('done', done);
              controller.close();
              return;
            }
            // Get the data and send it to the browser via the controller
            controller.enqueue(value);
            // Check chunks by logging to the console
            console.log(done, value);
            push();
          });
        }
        push();
      },
    });
  })
  .then((stream) =>
    // Respond with our stream
    new Response(stream, { headers: { 'Content-Type': 'text/html' } }).text()
  )
  .then((result) => {
    // Do things with result
    console.log(result);
  });

流式解析好像和server-sent events本身并没有关系，就算没有server-sent events也依然可以流式解析响应，我理解的对吗？请老师解惑。