Two React examples unsing a nodejs server to access them:
1 - under /react-0.12.2 folder and localhost:3000/reactjs/helloworld.html url -> show example from http://facebook.github.io/react/docs/getting-started.html
2 - under /public folder and localhost:3000/reactjsapp url --> show example from http://facebook.github.io/react/docs/tutorial.html