HttpServerErrorException$GatewayTimeout: 504 Gateway Time-out

This error message indicates that the server acting as a gateway or proxy did not receive a timely response from the upstream server it needed to access in order to complete a request. In other words, the gateway or proxy server attempted to access another server to fulfill a request, but that server did not respond within a specified time frame. This can be caused by a variety of issues, including network connectivity problems, overloaded servers, or slow response times from the upstream server. To resolve this error, check the connectivity between the servers and ensure that the upstream server is responding properly.