assertThat(request.headers["Content-Length"]!!.toInt()).isEqualTo(postBytes.size)
  }

  @ParameterizedTest
  @ArgumentsSource(ProtocolParamProvider::class)
  fun closeAfterFlush(
    protocol: Protocol,
    mockWebServer: MockWebServer,
  ) {
    setUp(protocol, mockWebServer)
    val postBytes = "FGHIJ".toByteArray()
    server.enqueue(MockResponse(body = "ABCDE"))
    val call =