val request = server.takeRequest()
    assertThat(request.requestLine).isEqualTo("POST /foo HTTP/1.1")
    assertArrayEquals(postBytes, request.body.readByteArray())
    assertThat(request.headers["Content-Length"]!!.toInt()).isEqualTo(postBytes.size)
  }

  @ParameterizedTest
  @ArgumentsSource(ProtocolParamProvider::class)
  fun closeAfterFlush(
    protocol: Protocol,
    mockWebServer: MockWebServer,
  ) {