for those who supply material to prospects by CloudFront, you can find techniques to troubleshoot and assist prevent this error by reviewing the CloudFront https://medium.com/@hh88entertainment/hh88%E9%AB%94%E8%82%B2%E5%8D%9A%E5%BD%A9%E7%9A%84%E6%9C%80%E4%BD%B3%E7%AD%96%E7%95%A5-6ed92ee352d4