Sending Files with Koa

sample route

myRoute.get("/download", async function (ctx) {
    try {
        const stream = fs.createReadStream(path.resolve(__dirname, '../public/img/350x150.png'));
        // ctx.type = 'image/png';
        // with attachment 
        // ctx.attachment(path.resolve( __dirname, '350x150.png'));
        ctx.set('Content-disposition', 'attachment; filename= file.png');
        ctx.body = stream;
    } catch (ex) {
        log.error(ex);
        ctx.status = 400;
        ctx.body = {success: false, message: ex.message};
    }
});