<a href = "https://static.3dmomoda.com/client/IOT%E%8F%AF%E8%A7%86%E5%8C%96%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%95%99%E7%A8%8B.pdf?response-content-type=application/octet-stream">
需要在后缀pdf后加上?response-content-type=application/octet-stream
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