Current request is not a multipart request

用vant組件和axios，post上傳圖片 不加content-type 報Current request is not a multipart request錯誤， 加了'Content-Type': 'multipart/form-data',報no multipart boundary was found錯誤， 兩個錯誤都是500，求大神指點，着急！！！

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