nginx as load balancer: Can it return to the client which app server the request was sent to?
Solution 1:
I guess, you're looking for $upstream_addr variable.
It will contain one of 192.168.104.xx:1124.
upstream appserver {
least_conn;
server 192.168.104.53:1124;
server 192.168.104.51:1124;
server 192.168.104.59:1124;
}
server {
listen 80;
server_name localhost;
location / {
proxy_pass http://appserver;
add_header "X-Upstream-Addr" $upstream_addr;
}
}