httpd mod_proxy fails attempting Unix domain socket though we configure none

Issue

• We see proxy requests on httpd begin to fail intermittently as they attempt some unix domain socket file like /var/run/rpc/xmlrpc.sock though we have no such configuration for this unix domain socket. Restarting clears this intermittent issue for a time before it begins again in another few days:

[Mon Apr 08 12:21:58.506710 2024] [proxy:error] [pid 9603:tid 140321992132352] (2)No such file or directory: AH02454: HTTPS: attempt to connect to Unix domain socket /var/run/rpc/xmlrpc.sock (localhost) failed
[Mon Apr 08 12:21:58.506741 2024] [proxy_http:error] [pid 9603:tid 140321992132352] [client 127.0.0.1:26741] AH01114: HTTP: failed to make connection to backend: httpd-UDS