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)：
api gateway not working
対処
関連リンク
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https://stackoverflow.com/questions/35644916/aws-api-gateway-not-working-same-after-deploying-api
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https://stackoverflow.com/questions/51240345/s3-redirection-rules-for-api-gateway-not-working/524234・・・
XMLHttpRequest to API GATEWAY not working - Stack Overflow
https://stackoverflow.com/questions/54211802/xmlhttprequest-to-api-gateway-not-working?rq=1
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