server.js

var http = require('http')
    , fs   = require('fs')
    , url  = require('url')
    , port = 8080;

var server = http.createServer (function (req, res) {
    var uri = url.parse(req.url)
    switch( uri.pathname ) {
        case '/':
            sendFile(res, 'index.html')
            break
        case '/index.html':
            sendFile(res, 'index.html')
            break
        case '/swplanets.csv':
            sendFile(res, 'swplanets.csv', 'text/csv');
            break;
        default:
            res.end('404 not found')
    }
})

server.listen(process.env.PORT || port);
console.log('listening on 8080')

// subroutines

function sendFile(res, filename, contentType) {
    contentType = contentType || 'text/html';

    fs.readFile(filename, function(error, content) {
        res.writeHead(200, {'Content-type': contentType})
        res.end(content, 'utf-8')
    })

}