nodejs_http_server.js

var http = new HttpServer();
http.listen(80);
var config = {
    "runtime" : function (request, response) {
        response.head(200, { 'Content-Tyep' : 'text/plain' });
        response.body('Hello World\n');
        response.end();
    }
}
http.run(config);

On line 5, there may be a mistake.
response.head(200, { 'Content-Tyep' : 'text/plain' });
I think it should be response.head(200, { 'Content-Type' : 'text/plain' });