1. 개요

AWS ELB 중 Classic Load Balancer 사용 시 504 발생할 때

2. 504 에러란?

504 Gateway Timeout

504 Gateway Timeout server error response code indicates that the server, while acting as a gateway or proxy, did not get a response in time from the upstream server that it needed in order to complete the request.

3. 참고

https://aws.amazon.com/ko/premiumsupport/knowledge-center/504-error-classic/