When uploading/streaming to S3 do you actually upload "twice?"

Question

I was wondering, since an upload stream passes through the server's buffer and than passed from the server to S3, am I actually uploading the file "twice".

First time I load (or stream) the file to the local server and than from the server to the cloud? Is there a way to skip the middle man and pass the files straight to S3?

Here's the code I'm using:

config.allowedContent = {
    $1: {
        // Use the ability to specify elements as an object.
        elements: CKEDITOR.dtd,
        attributes: true,
        styles: true,
        classes: true
    }
};
config.disallowedContent = 'img{width,height}';

When I render 'upload' on the get request, this is the client side code:

// Load the AWS SDK for Node.js
    var AWS = require('aws-sdk');
    var zlib = require('zlib');
    var multipart = require('connect-multiparty')

    module.exports = function (router) {
        router.get('/', function (req,res) {
        res.render('upload')

        })
        router.post('/',multipart(), function (req,res) {
            var body = fs.createReadStream(req.files.file.path).pipe(zlib.createGzip());
            var s3obj = new AWS.S3({params: {Bucket: 'bucketName', Key: 'aFileName.ext'}});
            s3obj.upload({Body: body}).
                on('httpUploadProgress', function(evt) { console.log(evt); }).
                send(function(err, data) { console.log(err, data) });
        })

    }

Am I going through my own server or am I uploading directly from the client?