Using coffee instead (derby new --coffee first-project)

src/server/serverError.coffee

@@ -0,0 +1,18 @@
+derby = require 'derby'
+{isProduction} = derby.util
+
+module.exports = (root) ->
+  staticPages = derby.createStatic root
+
+  return (err, req, res, next) ->
+    return next() unless err?
+
+    console.log(if err.stack then err.stack else err)
+
+    ## Customize error handling here ##
+    message = err.message || err.toString()
+    status = parseInt message
+    if status is 404
+      staticPages.render '404', res, {url: req.url}, 404
+    else
+      res.send if 400 <= status < 600 then status else 500