updated app

first-project/lib/server/serverError.js

@@ -0,0 +1,21 @@
+var derby = require('derby')
+  , isProduction = derby.util.isProduction
+
+module.exports = function(root) {
+  var staticPages = derby.createStatic(root)
+
+  return function(err, req, res, next) {
+    if (err == null) return next()
+
+    console.log(err.stack ? err.stack : err)
+
+    // Customize error handling here
+    var message = err.message || err.toString()
+      , status = parseInt(message)
+    if (status === 404) {
+      staticPages.render('404', res, {url: req.url}, 404)
+    } else {
+      res.send( ((status >= 400) && (status < 600)) ? status : 500)
+    }
+  }
+}