src/Response.php
public function contentAsset($asset = null) {
        if ($asset !== null) {
            $this->contentAsset = $asset;
            return $this;
        }

        return $this->contentAsset;
    }
public function contentAsset($asset = null) {
        if ($asset !== null) {
            $this->contentAsset = $asset;
            return $this;
        }

        return $this->contentAsset;
    }
Gets or sets the asset that will be rendered in the response.

@param string $asset Set a new value or pass `null` to get the current value.
@return Response|string Returns the current content asset or `$this` when settings.