val url = server.url("/").toUrl()
    val connection = url.openConnection() as HttpURLConnection
    assertThat(connection.getResponseCode()).isEqualTo(HttpURLConnection.HTTP_OK)
    val refusedConnection = url.openConnection() as HttpURLConnection
    assertFailsWith<ConnectException> {
      refusedConnection.getResponseCode()
    }.also { expected ->
      assertThat(expected.message!!).contains("refused")
    }
  }

  @Test

                response.setHttpStatusCode(con.getResponseCode());
                response.setHeaders(con.getHeaderFields());
            } catch (final Exception e) {
                throw new CurlException("Failed to access the response.", e);
            }
            writeContent(() -> {
                try {
                    if (con.getResponseCode() < 400) {