1x1の透明pngを表示するサンプル。
return response(base64_decode("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVQI12NgYAAAAAMAASDVlMcAAAAASUVORK5CYII="))->header('Content-type','image/png');
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