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elementUI,upload上传,后端返回文件流如何下载?

用的elementUI框架,在使用upload上传后,后端返回文件流,如果是get请求,会设置responseType="blob"进行下载,现在upload组件默认post请求,无法设置responseType="blob",下载下来报错,请问如何下载
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这样设置responseType不行吗

<el-upload
  :headers="{responseType:'blob'}"
>
</el-upload>

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