The error message 'epoll_wait() reported that client prematurely closed connection' is displayed in APIcast log

Issue

• When making a request from a client to APIcast, the client's timeout triggers and APIcast log shows a trace with epoll_wait() error as below:

  2023/06/09 06:45:30 [info] 25#25: *2880197 epoll_wait() reported that client prematurely closed connection, so upstream connection is closed too (104: Connection reset by peer) while sending request to upstream, client: 1.2.3.4, server: _, request: "POST /rest/v1.0/status HTTP/1.1", upstream: "http://1.4.5.6:9092/rest/v1.0/status", host: "myhostname.prod.svc.cluster.local:9092"