A bit of server code, referenced in a blog post on Scripting News

serverCodeForTwitter

//see this blog post for background -- http://scripting.com/2014/07/01/twitterApiUpdatewithmedia.html 

var buffer = new Buffer (body, "base64"); 
var params = {
	url: "https://api.twitter.com/1.1/statuses/update_with_media.json",
	oauth: {
		consumer_key: process.env.twitterConsumerKey,
		consumer_secret: process.env.twitterConsumerSecret,
		token: parsedUrl.query.oauth_token,
		token_secret: parsedUrl.query.oauth_token_secret
		}
	}
function requestCallback (error, response, body) {
	if (error) {
		errorResponse (error);    
		}
	else {
		dataResponse (response);
		}
	}
var r = request.post (params, requestCallback);
var form = r.form ();
form.append ("status", parsedUrl.status);
form.append ("media[]", buffer); //I believe this is where the problem lies! DW