title: Reading and returning multiple files in Node.js using fs.readFile
body: <p>I'm writing a simple request handler to return a pair of css files.  Using fs.readFileSync this was easy.  However, I'm having difficulty accomplishing the same task using the async version of readFile.  Below is my code.  Having my response.write() method calls split among two different callbacks seems to be problematic.  Can someone point out what I've done wrong? Interestingly this code works if I put response.end() inside of the first else statement.  However, that creates a problem in that the second css file does not get returned (because response.end() has already been fired).</p>
  
  <pre><code>function css(response) {
  
    response.writeHead(200, {"Content-Type": "text/css"});
  
    fs.readFile('css/bootstrap.css', function(error, content){
      if(error){
        console.log(error);
      }
      else{
        response.write(content);
      }
    });
    fs.readFile('css/bootstrap-responsive.css', function(error, content){
      if(error){
        console.log(error);
      }
      else{
        response.write(content)
      }
    });
    response.end();
  }
  </code></pre>