how to get real ip of server behind nginx

Question

i use nginx for load banlancing ,there are several servers behind nginx. how to konw the server which the request forward to ? Can I add the ip of the server that request forward to into header of reponse? if can ,how to do?

Answer 1

You can refer to nginx manual upstream section . $upstream_addr variable may be what you want.

And another method is to add trace code to the request. You can refer to this 3-rd module .