.sendResponse("response B\n")
        .receiveRequest("request C\n")
        .sendResponse("response D\n")
        .receiveRequest("request E\n")
        .sendResponse("response F\n")
        .exhaustRequest()
        .exhaustResponse()
    server.enqueue(
      MockResponse
        .Builder()
        .clearHeaders()
        .socketHandler(body)
        .build(),
    )
    val call =

    apply {
      actions += { stream ->
        val actual = stream.source.readUtf8(expected.utf8Size())
        if (actual != expected) throw AssertionError("$actual != $expected")
      }
    }

  fun exhaustRequest() =
    apply {
      actions += { stream ->
        if (!stream.source.exhausted()) throw AssertionError("expected exhausted")
      }
    }

  fun cancelStream() =
    apply {

          sendResponse("server says hello\n")
          receiveRequest("client says goodbye\n")
          sendResponse("server says goodbye\n")
          exhaustResponse()
          exhaustRequest()
        }
    server.enqueue(socketHandler.upgradeResponse())

    client
      .newCall(
        upgradeRequest(),
      ).execute()
      .use { response ->