cache-bust. 404 returns a 1×1 * transparent PNG so the music-box cover placeholder doesn't get a * broken-image icon while the bridge is starting up. */ public function coverImage(RigData $rig): SymfonyResponse { $path = $rig->coverPath(); if (is_file($path) && is_readable($path)) { return response()->file($path, [ 'Content-Type' => 'image/jpeg', 'Cache-Control' => 'no-store, max-age=0', ]); } // 1x1 transparent PNG (67 bytes). $png = base64_decode( 'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNkYAAAAAYAAjCB0C8AAAAASUVORK5CYII=' ); return response($png, 200, [ 'Content-Type' => 'image/png', 'Cache-Control' => 'no-store, max-age=0', ]); } }