擅长:python、mysql、java
<p>根据最新的文档(<a href="http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html" rel="noreferrer">http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-query-string-auth.html</a>):</p>
<blockquote>
<p>A presigned URL can be valid for a maximum of seven days because the
signing key you use in signature calculation is valid for up to seven
days.</p>
</blockquote>
<p>由于签名本身只能有效7天,因此签名的URL的有效期不可能超过7天。拥有永久有效URL的唯一方法是将文件公开。在</p>