CloseableHttpClient client = builder.build();
HttpHost host = new HttpHost(hostname, port);
HttpPost post = new HttpPost("/tsa");
TimeStampRequestGenerator generator = new TimeStampRequestGenerator();
TimeStampRequest timeStampRequest = generator.generate(TSPAlgorithms.SHA1, DigestHelper.digest("this is a test message"));
TimeStampRequest otherTimeStampRequest = generator.generate(TSPAlgorithms.SHA1, DigestHelper.digest("this is another test message"));
ByteArrayEntity entity = new ByteArrayEntity(Base64.encode(timeStampRequest.getEncoded()));
post.setHeader("Content-Type", TimestampServlet.TIMESTAMP_QUERY_CONTENT_TYPE);