SSL Pass-Through in Nginx Reverse proxy?

Question

Is it possible to use Nginx reverse proxy with SSL Pass-through so that it can pass request to a server who require certificate authentication for client.

It means s

Answer 1

Not sure how much it can work in your situation, but newer (1.9.3+) versions of Nginx can pass (encrypted) TLS packets directly to an upstream server, using the stream block :

stream {
  server {
    listen     443;
    proxy_pass backend.example.com:443;
  }
}

If you want to target multiple upstream servers, distinguished by their hostnames, this is possible by using the nginx modules ngx_stream_ssl_preread and ngx_stream_map. The concept behind this is TLS Server Name Indication. Dave T. outlines a solution nicely. See his answer on this network.