Many examples around the internet is using "X-NginX-Proxy"
Nowhere can I find a proper description of its purpose or why one would use it, apart from that it relates to using nginx as a proxy?
Example:
server {
listen 80;
server_name forum.example.org;
location / {
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 $scheme;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
...