gin 框架 官方文档 从reader读取信息 但是下载图片文件后 打开显示 似乎不支持此格式

Question

访问http://localhost:8080/test后，将下载url地址的图片并将其命名为123.png 但现在将其下载却打不开

func main() {
    router := gin.Default()
    router.GET("/test", func(c *gin.Context) {
        response, err := http.Get("https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E5%BC%A0%E7%B4%AB%E5%AE%81%E5%9B%BE%E7%89%87&hs=0&pn=1&spn=0&di=7136437450519347201&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&ie=utf-8&oe=utf-8&cl=2&lm=-1&cs=2643363613%2C2106712228&os=3028774708%2C1970574687&simid=2643363613%2C2106712228&adpicid=0&lpn=0&ln=30&fr=ala&fm=&sme=&cg=&bdtype=0&oriquery=%E5%BC%A0%E7%B4%AB%E5%AE%81%E5%9B%BE%E7%89%87&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fn.sinaimg.cn%2Fsinakd20111%2F539%2Fw1960h2579%2F20210619%2F9e65-74af1bfc3b1873479616e5a37bb490eb.jpg%26refer%3Dhttp%3A%2F%2Fn.sinaimg.cn%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1666405458%26t%3D02eb7dfb10fad465e8d88e94d0074659&fromurl=ippr_z2C%24qAzdH3FAzdH3Fh_z%26e3Bftgw_z%26e3Bv54_z%26e3BvgAzdH3Fw6ptvsj_0n9lnd0n8n_8kma11c18aa8aapj4p_z%26e3Bip4s&gsm=2&islist=&querylist=&dyTabStr=MCwzLDYsMiwxLDQsNSw4LDcsOQ%3D%3D.jpg")
        //    StatusCode 响应体的状态码
        if err != nil || response.StatusCode != http.StatusOK {
            //Status设置HTTP响应码 503
            c.Status(http.StatusServiceUnavailable)
            return
        }
        reader := response.Body //响应体
        contentLength := response.ContentLength
        contentType := response.Header.Get("Content-Type") //获得 响应体数据类型
        extraHeaders := map[string]string{
            "Content-Disposition": `attachment; filename="123.png"`,
        }
        // DataFromReader 将指定的读取器写入主体流 并 更新HTTP代码
        c.DataFromReader(http.StatusOK, contentLength, contentType, reader, extraHeaders)
    })
    router.Run(":8080")
}