{
DKIMSignature signed = new DKIMSignature();
signed.setAttribute("path", "/hello/world");
signed.setTimestamp();
signed.addHeader("Visa");
signed.addHeader("Visa");
MultivaluedMapImpl<String, String> headers = new MultivaluedMapImpl<String, String>();
headers.add("Visa", "v1");
headers.add("Visa", "v2");
headers.add("Visa", "v3");
signed.sign(headers, null, keys.getPrivate());