How to send images through Worklight server withou

I`m trying to find out how to send images to my back-end server using Worklight adapters. I know that I can send them through Worklight adapters using Base64 encoding but this implies in around 30% more traffic between the servers and some undesired processing overhead.

For now I`m using the Phonegap FileTransfer library as I show below, but this creates a directly connection between the client and the back-end server not going through Worklight server as I want.

var options = new FileUploadOptions();
options.fileKey="file";
options.fileName=imageURI.substr(imageURI.lastIndexOf('/')+1);
options.mimeType="image/jpeg";

var headers = {"Content-Type": "image/jpeg"};
options.headers = headers;

var ft = new FileTransfer();
ft.upload(imageURI, encodeURI(host + "/images"), imageUploadSuccess, imageUploadFail, options);

function imageUploadSuccess(r) {
    WL.Logger.debug("Submit success! HTTP Status Code = " + r.responseCode);
    WL.Logger.debug("Response = " + r.response);
    WL.Logger.debug("Bytes sent = " + r.bytesSent);
    $.mobile.changePage('#SuccessPage');
}
function imageUploadFail(error) {
    WL.Logger.debug("submit error! source = " + error.source);
    WL.Logger.debug("target = " + error.target);
    $.mobile.changePage('#FailPage');
}

Is there a way that I can do that?

Thank you in advance.

-- Edit --

Another problem that occurs is that when my backend server receives the file, it seems corrupted and cannot be readed as an image.

At this time, Worklight adapters do not support sending data in binary form.

This means that currently your only option is the one you do not like, which is to base64 encode the image file and store the resulting string in the database and when you need to use it, to base64 decode it.