yield ServerSentEvent(data="hello", event="greeting", id="1")
    yield ServerSentEvent(data={"key": "value"}, event="json-data", id="2")
    yield ServerSentEvent(comment="just a comment")
    yield ServerSentEvent(data="retry-test", retry=5000)


@app.get("/items/stream-mixed", response_class=EventSourceResponse)
async def sse_items_mixed() -> AsyncIterable[Item]:
    yield items[0]
    yield ServerSentEvent(data="custom-event", event="special")

      // If the problem was a CertificateException from the X509TrustManager,
      // do not retry.
      if (e.cause is CertificateException) {
        return false
      }
    }
    if (e is SSLPeerUnverifiedException) {
      // e.g. a certificate pinning error.
      return false
    }
    // An example of one we might want to retry with a different route is a problem connecting to a

    if data_str is not None:
        for line in data_str.splitlines():
            lines.append(f"data: {line}")

    if id is not None:
        lines.append(f"id: {id}")

    if retry is not None:
        lines.append(f"retry: {retry}")

    lines.append("")
    lines.append("")
    return "\n".join(lines).encode("utf-8")


# Keep-alive comment, per the SSE spec recommendation

    var tlsConnectDelayNanos = 0L
    var tlsConnectThrowable: Throwable? = null
    var connectTlsNextPlan: FakePlan? = null

    fun createRetry(): FakePlan {
      check(retry == null)
      return FakePlan(nextPlanId++)
        .also {
          retry = it
        }
    }

    fun createConnectTcpNextPlan(): FakePlan {
      check(connectTcpNextPlan == null)
      return FakePlan(nextPlanId++)
        .also {

     * @param retryAfterSeconds the Retry-After header value
     * @throws IOException if an I/O error occurs
     */
    protected void sendRateLimitResponse(final HttpServletResponse response, final int retryAfterSeconds) throws IOException {
        response.setStatus(429); // Too Many Requests
        response.setContentType("application/json;charset=UTF-8");
        response.setHeader("Retry-After", String.valueOf(retryAfterSeconds));

    }

    /**
     * Sets the retry interval in milliseconds.
     *
     * @param retryInterval The retry interval.
     */
    public void setRetryInterval(final long retryInterval) {
        this.retryInterval = retryInterval;
    }

    /**
     * Sets the maximum retry count.
     *
     * @param maxRetryCount The maximum retry count.
     */

 *    we must send a `CONNECT` request, and handle authorization challenges from the proxy.
 *  * Optional [TLS handshake][connectTls].
 *
 * Each step may fail. If a retry is possible, a new instance is created with the next plan, which
 * will be configured differently.
 */
class ConnectPlan internal constructor(
  private val taskRunner: TaskRunner,

    return result
  }

  private fun cancelInFlightConnects() {
    for (plan in tcpConnectsInFlight) {
      plan.cancel()
      val retry = plan.retry() ?: continue
      routePlanner.deferredPlans.addLast(retry)
    }
    tcpConnectsInFlight.clear()
  }

        // 15
        "event\r\n".encodeUtf8(),
        // 16
        "event\r".encodeUtf8(),
        // 17
        "event\n".encodeUtf8(),
        // 18
        "retry: ".encodeUtf8(),
        // 19
        "retry:".encodeUtf8(),
      )

    private val CRLF = "\r\n".encodeUtf8()

    @Throws(IOException::class)
    private fun BufferedSource.readData(data: Buffer) {

        response.setStatus(429);
        response.setContentType("application/json;charset=UTF-8");
        response.setHeader("Retry-After", String.valueOf(RETRY_AFTER_SECONDS));
        response.getWriter()
                .write("{\"response\":{\"status\":9,\"message\":\"Server is busy. Please retry after " + RETRY_AFTER_SECONDS
                        + " seconds.\",\"retry_after\":" + RETRY_AFTER_SECONDS + "}}");
    }