ngx_lua + proxy_next_upstream (no replies)

Hello,

I have configured:
1. ngx_lua as rewrite_by_lua_file
2. lua returns upstream
3. Nginx connects to the upstream
Works perfectly.

The question is how can I archive proxy_next_upstream.
Preferably I would like to return to lua with a error reason.
If the only way is to return several servers in upstream from lua, how to
do so ?

I'm currently setting ngx.var.upstream and then proxy_pass http://$upstream..
I suppose the simplest method would be to set the $upstream in correct
format. But what about my preferably method?

Cheers,
Jędrzej Nowak
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