Camel 2.12.1 : How to send Http post with an attachment using ProducerTemplate

Hi,

 I tried to use producerTemplate to send a http post with an attached file. 

ProducerTemplate template = context.createProducerTemplate();

        Exchange exchange = template.send("http://localhost:8080/file",
                new Processor() {
                    public void process(Exchange exchange) throws Exception {

                        Message msgIn = exchange.getIn();
                        String userHome=System.getProperty("user.home");
                        File file = new File(userHome + "/test.txt");
                        DataHandler dh = new DataHandler(new FileDataSource(file));
                       
                        msgIn.addAttachment("myFile",dh);
                        msgIn.setHeader(Exchange.CONTENT_TYPE, "multipart/form-data");
                       
                        msgIn.setHeader(Exchange.HTTP_METHOD, "POST");
                    }

        });

At the server side, I received something like :

RequestContext(HttpRequest(POST,http://localhost:8080/file,List(Content-Length: 0, Host: localhost:8080, User-Agent: Jakarta Commons-HttpClient/3.1, breadcrumbId: ID-gauss-site-41171-1402599541172-0-1),Empty,HTTP/1.1),Actor[akka://default/temp/$a],)

The Context type and the attached file seem not to have reached the server.

Is the above a correct way  to send http post with attachment ?

Thanks in advance for any assistance !

Shing