@Test
  public void uploadEmptyFileWithOriginalWebClient() throws IOException {
    File emptyFile = new File("prov2_empty.txt");
    if (!emptyFile.exists()) {
      emptyFile.createNewFile();
    }

    try {
      WebClient orgWebClient = WebClient.builder().build();
      Mono<String> monoUploadEmpty = orgWebClient.post()
          .uri("http://any_web_that_support_post_file")
          .body(BodyInserters.fromResource(new FileSystemResource(emptyFile)))
          .retrieve()
          .bodyToMono(String.class);

      StepVerifier.create(monoUploadEmpty)
          .expectNextCount(1)
          .verifyComplete();

    }finally {
      emptyFile.delete();
    }
}