title: Using certificates.cer with NodeJs HTTPS
body: <p>I have generated a .cer file for IOS push notifications and I would ike to use it with NodeJS HTTPS module.</p>
  
  <p>The only examples I found for HTTPS module work with .pem and .sfx files, not .cer :</p>
  
  <pre><code>var options = {
    key: fs.readFileSync('test/fixtures/keys/agent2-key.pem'),
    cert: fs.readFileSync('test/fixtures/keys/agent2-cert.pem')
  };
  
  or 
  
  var options = {
    pfx: fs.readFileSync('server.pfx')
  }
  
  https.createServer(options, function (req, res) {
    res.writeHead(200);
    res.end("hello world\n");
  }).listen(8000);
  </code></pre>
  
  <p>Any solution ?</p>