how do i get the x-forwarded-for ip address in server access logs? i tried this log format in the server section, but i still get the default logs

how to fix this? thanks

server { listen 8070; server_name .XX.com; log_format main '$remote_addr - $remote_user [$time_local] $request ' '"$status" $body_bytes_sent "$http_referer"' '"$http_user_agent" "$http_x_forwarded_for"' '"$gzip_ratio" "$upstream_status" "$upstream_response_time" "$upstream_addr"'; access_log logs/access_pop.log; error_log logs/error_pop.log; location / { root /home/mark/work/pop; fastcgi_pass backend_pop; include /home/mark/work/infrastructure/nginx_fastcgi.conf; } }