Hi,

I have an nginx configured as a reverse proxy using proxy_pass.
This is a dynamic reverse proxy, it fetches content for users in accordance to the HOST header in the requests.
The problem I encountered is that the backends are normally SSL, and every request that goes has to re-handshake (since there is no keep-alive between nginx and the backend servers).
I know that I can configure keep-alive with upstream - but that requires me to know upfront which servers will be used (which I don't, since I dynamically fetch content according to headers).
Is there a way to configure that the proxy will keep-alive connections with backend servers dynamically, or for some time?

Thanks,
Roy.