gistfile1.txt

var http = require('http');
var querystring = require('querystring')
var url = require('url');

//pointless async function


function doAsyncMath(param1,param2,callback){


	var sum = param1 + param2

	
  	//first param in callbacks is usually the error
  	callback(null,sum)



}



// Configure our HTTP server to respond with Hello World to all requests.
var server = http.createServer(function (request, response) {


	


	//same basic thing, but here just using an anonymnous func as the callback
	doAsyncMath(1,2,function(err,sum){
		//err and sum here come from the callback on line 15


		if(err) return response.end(err)

		response.writeHead(200, {"Content-Type": "text/plain"});
		response.end(sum.toString());
	})



  
});

// Listen on port 8000, IP defaults to 127.0.0.1
server.listen(8000);

// Put a friendly message on the terminal
console.log("Server running at http://127.0.0.1:8000/");