How can I change kubernetes pod namespace dynamically in a backend of HA proxy? Basically, what I need is the reference to the 2nd matched pattern group of reqrep to be used as the namespace in server or extract the namespace from the Referer, say if the referer is https://example.name.net/abc/app/v1, the namespace should be abc.
backend My_Web_Server
balance roundrobin
option forwardfor
http-request set-header X-Forwarded-Port %[dst_port]
http-request set-header X-Forwarded-Host %[req.hdr(Host)]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
option httpchk HEAD / HTTP/1.1\r\nHost:localhost
acl fail-validation req.fhdr(X-Haproxy-ACL) -m found
http-request deny if fail-validation
reqrep ^([^\\ ]*)\\ (.*)/app/(.*) \\1\\ /app/\\3
server <server-name> <kubernetes-pod-name>.<namespace>:<port>
