[server/router/handlers] Fix not_implemented message on final handler

Author: pandres95

lib/server/router/handlers.js

@@ -3,10 +3,18 @@
 module.exports = function ({ Error, views: { Json } }, router) {
     let json = new Json();
 
-    // 404 Handler. Acts when a resource call isn't found
-    router.use((request, response) => json.error(
-        new Error(404, 'method_not_found', 'Method wasn\'t found'), response
-    ));
+    // Final handler. Acts when a resource call isn't found
+    router.use((request, response) => {
+        const notImplementedError = new Error(501,
+            'not_implemented', 'Method haven\'t been implemented yet');
+        if (response.headersSent === false) {
+            if (request.path === '/' && request.method === 'GET') {
+                json.standard('Welcome to API!', response);
+            } else {
+                json.error(notImplementedError, response);
+            }
+        }
+    });
 
     // Error Handler. Processes an error output view.
     router.use((error, req, response, next) => json.error(error, response));