headers.putSingle("Content-Location", "http://host/bar");
headers.putSingle("custom-header", "custom");
Attachment att = new Attachment(is1, headers);
MultipartBody body = new MultipartBody(att);
MultipartBody body2 = client.post(body, MultipartBody.class);
InputStream is2 = body2.getRootAttachment().getDataHandler().getInputStream();
byte[] image1 = IOUtils.readBytesFromStream(
getClass().getResourceAsStream("/org/apache/cxf/systest/jaxrs/resources/java.jpg"));
byte[] image2 = IOUtils.readBytesFromStream(is2);
assertTrue(Arrays.equals(image1, image2));