HttpClient and MultipartEntity vs. Jersey Multipart


I have a rest webservice that takes a POST metod with multipart message:

public String multipartTest(com.sun.jersey.multipart.MultiPart data) {  
try {  
// get first body part (index 0)          
BodyPart bp = multiPart.getBodyParts().get(0);  

Now I am trying to write a java client for that. I started with a simple jersey client: view plaincopy to clipboardprint?

  MultiPart multiPart = new MultiPart();  
    multiPart.bodyPart( new BodyPart(wavestream,MediaType.APPLICATION_OCTET_STREAM_TYPE)); 

    Client c = Client.create();  
    WebResource r = c.resource("");
response=r.path("transferFile").type(MediaType.MULTIPART_FORM_DATA).accept(MediaType.APPLICATION_XML).post(String.class, multiPart);  

This works great - everything is ok. However I need this client working on Android and I have trouble with using jersey on that platform. So I used the normal way to send multipart message on android:

    HttpClient client = new DefaultHttpClient();
 client.getParams().setParameter("http.socket.timeout", new Integer(90000)); // 90 second

HttpPost httpPost = new HttpPost("");
 httpPost.setHeader("Content-Type", MediaType.MULTIPART_FORM_DATA );

//tried with and without base64
 byte [] encodedWavestream = Base64.encodeBytesToBytes(wavestream);
 InputStream ins = new ByteArrayInputStream(encodedWavestream);
 InputStreamBody body = new InputStreamBody(ins, "test" );
 int send = ins.available();

MultipartEntity requestContent = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE );
requestContent.addPart("stream", body);

HttpResponse Response = client.execute(httpPost);

An this gives an annoying response from the server :

HTTP Status 400 - Bad Request  
The request sent by the client was syntactically incorrect (Bad Request).  

I check the server log files but there is nothing there. So I don’t know what’s the origin of this error. I have wrote a simple html page with a post formula and ‘multipart/form-data’ content-type and it also works! An auto-generated request from soapUI also works! Why my client does not work? Can anybody help?