Send image through Http Post

Hello everyone, I'm trying to send a node file (Client) to my Java web service using Jersey the file is received correctly using POSTMAN this is my Java code:

@POST
@Path("eliminar")
@Consumes({ MediaType.MULTIPART_FORM_DATA, ("text/plain") })
@Produces(MediaType.APPLICATION_JSON)
public Response eliminar(
        @FormDataParam("attachment") InputStream fileInputStream,
        @FormDataParam("attachment") FormDataContentDisposition cdh){
        try{
            if(fileInputStream==null){
             System.out.println("Nulo");    
            }else{                  
                 saveFile(fileInputStream, "C://logs/"+ObjectId.get().toString()+".png");
            }
        }catch(Exception e){
             System.out.println("Catch "+e.getMessage());                                       
        }
    return Response.ok().entity("Eliminar").build();
}

private void saveFile(InputStream uploadedInputStream,String serverLocation) {
    try {
        System.out.println(serverLocation);
        OutputStream outpuStream = new FileOutputStream(new File(serverLocation));
        int read = 0;
        byte[] bytes = new byte[1024];
        outpuStream = new FileOutputStream(new File(serverLocation));
        while ((read = uploadedInputStream.read(bytes)) != -1) {
            outpuStream.write(bytes, 0, read);
        }
        outpuStream.flush();
        outpuStream.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

In this part I only move the file I receive to another folder, to check that it has been received correctly.

  

Node Code:

conImagen: function() {
  var bitmap = fs.readFileSync("C:/Users/obar/Desktop/prueba.png"); // Intento subir este archivo como muestra
  var valor= new Buffer(bitmap).toString('base64'); // genero el buffer para enviarlo por Post
  var parts = {
    attachment: {
      contentType: 'image/png',
      filename: 'prueba.png',
      value:valor,
    }
  };
  var formData = MultipartFormData(parts);
  HTTP.call(
    'POST',
    'http://localhost:8080/restdemo/jaxrs/customers/eliminar', {
      content: formData.content,
      headers: formData.headers
    },
    function(error, result) {
      if (error) {
        console.log(error, 'Error');
      }
      if (result) {
        var statusCode=result.statusCode;
        var content=result.content;
        console.log("result "+content);
      }
    }
  );
}

My Multipart function is:

MultipartFormData=function(parts) {
var boundary = '----' + (new Date()).getTime();
var bodyString = [];
_.each(parts, function(value, name, blah) {
  console.log("value "+JSON.stringify(value)+" name "+name);
  if (name === 'attachment') {
    bodyString.push(
      '--' + boundary,
      'Content-Disposition: form-data; name="' + name + '";' +
      'filename="' + value.filename + '"',
      'Content-type: ' + value.contentType,
      '',
      value.value);
  } else {
    bodyString.push(
      '--' + boundary,
      'Content-Disposition: form-data; name="' + name + '"',
      '',
      value);
  }
});
bodyString.push('--' + boundary + '--', '');
return {
  content: bodyString.join('\r\n'),
  headers: {
    'Content-Type': 'multipart/form-data;boundary=' + boundary
  }
}
}

The file is received but corrupted.