Node.js rendering either html or css, not both - html

Question

Beginning my first node.js project and I'm finding that my code renders either the html with no styling, or the css code as plain text to the screen. I open the page and see the html code, change nothing but hit refresh, and I see the css, and it switches back and forth every time I hit refresh. Can anyone tell me how to get it to apply the styling? Thanks. My code:
http.createServer(function (req, res) {
if(req.method.toLowerCase() == 'get'){
fs.readFile('path\\to\\index.html', function (err, data) {
if (err) console.log(err);
res.writeHead(200, {'Content-Type': 'text/html'});
res.write(data);
//res.end();
});
}
if(req.method.toLowerCase() == 'get'){
fs.readFile('path\\to\\mystyle.css', function (err, data1) {
if (err) console.log(err);
res.writeHead(200, {'Content-Type': 'text/css'});
res.write(data1);
//res.end();
});
}
}).listen(4000, '127.0.0.1');
console.log('Server running at http://127.0.0.1:4000/');
The reason I have the 'res.end()'s commented out is that when I left either or both of them in, I got a 'write after end' error. But I presume my problem is somewhere in that?
Edit: Just to add, I get the same problem if I remove both IF statements. If I enclose both readFiles within the same IF statement, I get the 'write after end'.

Answer 1

This is what worked in the end:
var http = require('http');
var fs = require('fs');
var formidable = require("formidable");
var util = require('util');
var url = require('url');
var html;
fs.readFile(__dirname+'\\index.html', function(err, data) {
if (err){
console.log(err);
response.writeHead(404, {'Content-Type': 'text/html'});
}
html = data;
});
var css;
fs.readFile(__dirname+'\\mystyle.css', function(err, data) {
if (err){
console.log(err);
response.writeHead(404, {'Content-Type': 'text/html'});
}
css = data;
});
var js;
fs.readFile(__dirname+'\\management.js', function(err, data) {
if (err){
console.log(err);
response.writeHead(404, {'Content-Type': 'text/html'});
}
js = data;
});
var server = http.createServer(function (request, response) {
switch (request.url) {
case "/mystyle.css" :
response.writeHead(200, {"Content-Type": "text/css"});
response.write(css);
break;
case "/management.js" :
response.writeHead(200, {"Content-Type": "text/javascript"});
response.write(js);
break;
default :
response.writeHead(200, {"Content-Type": "text/html"});
response.write(html);
};
response.end();
})
server.listen(4000);
console.log('server is listening at 4000');
You could easily put all the code inside the createServer function but the key is the switch.