このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
proxy error
対処
関連リンク
502 proxy error on deploy to AWS - Stack Overflow
https://stackoverflow.com/questions/41453378/502-proxy-error-on-deploy-to-aws
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https://stackoverflow.com/questions/52937886/how-to-troubleshoot-cannot-connect-to-proxy-error-aws-s・・・
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https://stackoverflow.com/questions/46941791/proxy-error-502-aws-after-configuring-ebextensions
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https://stackoverflow.com/questions/38909660/aws-ec2-responds-with-http-502-when-trying-to-upload-me・・・
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https://stackoverflow.com/questions/38288966/getting-502-proxy-error-after-deploying-app-to-aws
AWS-CLI利用に伴うエラー - スタック・オーバーフロー
https://ja.stackoverflow.com/questions/20726/aws-cli%E5%88%A9%E7%94%A8%E3%81%AB%E4%BC%B4%E3%81%86%E3・・・
How to Fix Amazon Prime HTTP Proxy Error? - The VPN Guru
https://thevpn.guru/amazon-prime-http-proxy-error-fix-workaround/
502 Proxy Error The proxy server received an invalid response from ...
https://www.youtube.com/watch?v=0XQhiFCXnMw
https://www.youtube.com/watch?v=0XQhiFCXnMw
【Apache】http 通信を https 通信に変換してプロキシする - きゃまなかのブログ
http://techblog.kyamanak.com/entry/2018/04/29/225347