Add middlewares for API and various improvements (#685)

middleware/api-template.js

@@ -0,0 +1,13 @@
+module.exports = async (ctx, next) => {
+    await next();
+    if (ctx.request.path.startsWith('/api/')) {
+        if (ctx.body.counter > 0) {
+            return ctx.res.ok({
+                message: `request returned ${ctx.body.counter} ${ctx.body.counter > 1 ? 'routes' : 'route'}`,
+                data: ctx.body.result,
+            });
+        } else {
+            return ctx.res.noContent();
+        }
+    }
+};