If you want JSON instead: location /ip { add_header Content-Type "application/json"; return 200 '{"host":"$server_name"

If you want JSON instead: location /ip { add_header Content-Type "application/json"; return 200 '{"host":"$server_name","ip":"$remote_addr","port":"$remote_port","server_ip":"$server_addr","server_port":"$server_port"}\n'; }