wget下载不安全的https域名报错

使用wget命令获取文件时报以下错误!

WARNING: cannot verify xxxx's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
  Issued certificate has expired.
HTTP request sent, awaiting response... No data received.
Retrying.

解决办法

sudo yum install -y ca-certificates

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