cabecerasJson.js

var http=require('http');
var server = http.createServer();
server.on('request', procesa);
server.listen(3000);

function procesa(request,response) {
 console.log("URL solicitada = " + request.url);
 response.setHeader("Content-Type", "application/json");
 response.write("[{\"alumno\": 23, \"nota\": 8}, {\"alumno\": 34, \"nota\": 6}]");
 response.end();
}