*/
  override fun cancel() {
    if (canceled) return // Already canceled.

    canceled = true
    exchange?.cancel()
    for (plan in plansToCancel) {
      plan.cancel()
    }

    eventListener.canceled(this)
  }

  override fun isCanceled(): Boolean = canceled

  override fun execute(): Response {

        .body(
          """
          |data: hey
          |
          |
          """.trimMargin(),
        ).setHeader("content-type", "text/plain")
        .build(),
    )
    newEventSource()
    listener.assertFailure("Invalid content-type: text/plain")
  }

  @Test
  fun badResponseCode() {
    server.enqueue(
      MockResponse
        .Builder()
        .body(
          """