client => connection close => proxy_pass => keepalive

Hi
nginx/1.8.0

I would like to be able to proxy http requests from a client via proxy_pass to upstream servers where the http connection from the client is closed and the http connection to the proxy_pass upstream is kept open. eg.

#close all client requests
keepalive_timeout 0;

upstream domain {
server domain.com;
keepalive 50;
}

server {
listen 8080;
server_name 127.0.0.1;
location /domain {
proxy_pass http://domain/req;
proxy_http_version 1.1;
proxy_set_header Connection "";
proxy_set_header Host domain.com;
#keep upstream connections open for 1 day
keepalive_timeout 86400s;
}
}

The intention is to keep 50 persistent connections to domain.com open for 1 day and close client connections to 127.0.0.1:8080/domain as and when the upstream returns a response. The result with keepalive_timeout 0; globally is that no upstream connections are re-used and with keepalive_timeout set to 86400s both client and upstream connections are kept established. Please help.

Regards