HTTP/1.0 503 Service Unavailable
pragma: no-cache
cache-control: private, max-age=0, no-cache, no-store
content-type: text/html

AWS ELB2.0

HTTP/1.1 400 Bad Request
Server: awselb/2.0
Date: Tue, 04 Jun 2024 17:25:09 GMT
Content-Type: text/html
Content-Length: 622
Connection: close