refactor: optimize favicon fetcher with cache

app/exceptions/favicon_not_found_exception.ts

@@ -0,0 +1,20 @@
+import { Exception } from '@adonisjs/core/exceptions';
+import { HttpContext } from '@adonisjs/core/http';
+import logger from '@adonisjs/core/services/logger';
+import { createReadStream } from 'node:fs';
+import { resolve } from 'node:path';
+
+export default class FaviconNotFoundException extends Exception {
+  static status = 404;
+  static code = 'E_FAVICON_NOT_FOUND';
+
+  async handle(error: this, ctx: HttpContext) {
+    const readStream = createReadStream(
+      resolve(process.cwd(), './public/empty-image.png')
+    );
+
+    ctx.response.header('Content-Type', 'image/png');
+    ctx.response.stream(readStream);
+    logger.debug(error.message);
+  }
+}