http stream

// See http://stackoverflow.com/questions/21934831/nodejs-express-stream-stdout-instantly-to-the-client

var cp = require("child_process"),
	express = require("express"),
	app = express();

app.get('/', function(req, res){
	
	res.writeHead(200, { "Content-Type": "text/event-stream" });
	
	var spw = cp.spawn('ping', ['127.0.0.1']),
		str = "";
	
	
	spw.stdout.on('data', function (data) {
		str += data.toString();
		
		console.log("data");
		
		// Flush out line by line.
		var lines = str.split("\n");
		for(var i in lines) {
			if(i == lines.length - 1) {
				str = lines[i];
			} else{
				res.write(lines[i] + "\n");	
			}
		}
	});
	
	spw.on('close', function (code) {
		res.end(str);
	});
	
	spw.stderr.on('data', function (data) {
		res.end('stderr: ' + data);
	});
	
	
});

app.listen(3000);