let fileUrl = 'https://demo.com/a.ipg';
wx.downloadFile({ url: fileUrl, success(res) { wx.openDocument({ filePath: res.tempFilePath, showMenu: true }); } })
1.确定数据没有经过跳转
curl -I https://demo.com/a.ipg
2.确定证书链的完整性
openssl s_client -connect demo.com:443 -showcerts
Verification error: unable to get local issuer certificate -> 说明 你的域名证书链不完整