generates image using node canvas module on server

node-canvas-http.js

// https://github.com/learnboost/node-canvas
// https://github.com/LearnBoost/node-canvas/wiki
// sudo apt-get install libcairo2-dev
// npm install canvas

var http = require('http');
var url = require('url');
var Canvas = require('canvas');

// http://stage.sl.pt:8080/?t=hi%20there

http.createServer(function(req, res) {
	if (req.url === '/favicon.ico') {
		res.writeHead(200, {'Content-Type': 'image/x-icon'});
		return res.end();
	}

	var u = url.parse(req.url, true);
	console.log(u.pathname, u.query);
	
	var t = u.query.t;
	
	var canvasEl = new Canvas(200, 200);
	var ctx = canvasEl.getContext('2d');

	ctx.font = '30px Impact';
	ctx.rotate(.1);
	ctx.fillText(t, 50, 100);
	
	var te = ctx.measureText(t);
	ctx.strokeStyle = 'rgba(0,0,0,0.5)';
	ctx.beginPath();
	ctx.lineTo(50, 102);
	ctx.lineTo(50 + te.width, 102);
	ctx.stroke();

	var buf = canvasEl.toBuffer();
	res.writeHead(200, {'Content-Type': 'image/png'});
	res.end(buf, 'binary');
}).listen(8080);