NGINX as reverse proxy - forwarding not working - https

Question

I've the following:
HTTPS access to a NAS or something like that.
NGINX as reserve proxy as container
Container with a Tomcat as appcontainer.
NAS forwards HTTPS request as HTTP to NGINX container. Then NGINX container forwards HTTP request to my appcontainer.
I can access to my appcontainer login page but after login a POST is made as follows
Nginx access.log
POST /foo/login.do HTTP/1.1" 302 0 "https://nas.dns.server/foo/login.do
In localhost_access.log in appcontainer tomcat shows
POST /foo/doLogin.do HTTP/1.0" 302
And request as HTTP to the NAS
It seems that is ignoring X-Forwarded-Proto header.
My nginx.conf is configured as follows:
server {
listen 80;
server_name $hostname;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
error_log /dev/stdout info;
access_log /dev/stdout;
client_max_body_size 100M;
proxy_connect_timeout 300;
proxy_send_timeout 300;
proxy_read_timeout 300;
send_timeout 300;
resolver 127.0.0.11 valid=30s;
sendfile on;
location /foo {
proxy_set_header Origin "";
set $appcontainer http://appcontainer:8080;
proxy_pass $appcontainer;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $https; #I’ve also tested with $scheme
}
}
Thanks

Answer 1

Having a look to the Developer Tool of Chrome in the Network tab in can see that for the call of login.do there is Request URL: https://entry.proxy.url/foo/doLogin.do but in the Response Headers I can see what is generating the problem Location: http://proxy.entry.url/foo/login.do that must be Location: https://proxy.entry.url/foo/login.do .
I've tried doing redirection as proxy_redirect http://entry.proxy.url/ https://csprocure.ciport.be/; in the location and it works.
So location is set as:
location /foo {
proxy_set_header Origin "";
set $appcontainer http://appcontainer:8080;
proxy_redirect http://proxy.entry.url/ https://proxy.entry.url/;
proxy_pass $appcontainer;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $https; #I’ve also tested with $scheme
}