Improve error page

Author: ljl

src/main/resources/site/error/error.html

@@ -13,6 +13,7 @@
 <main>
     <h1 th:text="'Error: ' + ${errorCode} ">Error</h1>
     <p>Please try again later, or contact site administrator</p>
+    <pre th:text="${message}">Error message</pre>
 </main>
 </body>
 

src/main/resources/site/error/error.js

@@ -12,7 +12,8 @@ exports.handleError = function (err) {
     }
 
     var model = {
-        errorCode: err.status
+        errorCode: err.status,
+        message: err.message
     };
     var body = thymeleaf.render(view, model);