I have a setup where HTTP(S) traffic goes from HAProxy to nginx.

            HAProxy    nginx
HTTP -----> :80  ----> :9080
HTTPS ----> :443 ----> :9443

I'm having troubles with implicit redirects caused by trailing slashes going from https to http, like this:

$ curl -k -I https://www.example.com/subdir
HTTP/1.1 301 Moved Permanently
Server: nginx/1.2.4
Date: Thu, 04 Oct 2012 12:52:39 GMT
Content-Type: text/html
Content-Length: 184
Location: http://www.example.com/subdir/

The reason obviously is HAProxy working as SSL unwrapper, and nginx sees only http requests. I've tried setting up the X-Forwarded-Proto to https on HAProxy config, but it does nothing.

My nginx setup is as follows:

server {
  listen       127.0.0.1:9443;
  server_name  www.example.com;

  port_in_redirect off;

  root   /var/www/example;
  index  index.html index.htm;
}

And the relevant parts from HAProxy config:

frontend https-in
    bind *:443 ssl crt /etc/example.pem prefer-server-ciphers
    default_backend nginxssl

backend nginxssl
    balance roundrobin
    option forwardfor
    reqadd X-Forwarded-Proto:\ https
    server nginxssl1 127.0.0.1:9443