NGINX Proxy_pass : use proxy_host as the request header host - nginx

Question

I am trying to proxy_pass to a website, But I want the request header host to be the same as the website I passed.
I have tried to use "proxy_set_header Host $proxy_host" (and tried change the value to $host, even the exact hostname I want. But when I use google chrome to check the request host, it is still the server IP that I used to set up the proxy_pass.
Below is my config, please help
location / {
proxy_pass https://example.com;
proxy_set_header Host $proxy_host;
proxy_set_header X-Original-URI $request_uri;
}
Thank you

Answer 1

Check the examples from the docs:
nginx first decides which server should process the request. Let’s start with a simple configuration where all three virtual servers listen on port *:80:
server {
listen 80;
server_name example.org www.example.org;
...
}
server {
listen 80;
server_name example.net www.example.net;
...
}
server {
listen 80;
server_name example.com www.example.com;
...
}
In this configuration, nginx tests only the request’s header field Host to determine which server the request should be routed to. If its value does not match any server name, or the request does not contain this header field at all, then nginx will route the request to the default server for this port. In the configuration above, the default server is the first one — which is nginx’s standard default behaviour. It can also be set explicitly which server should be default, with the default_server parameter in the listen directive:
server {
listen 80 default_server;
server_name example.net www.example.net;
...
}
Now keep in mind that $host is specifically the first server_name that is defined in the current server block. if you have multiple server_name's, only the first one will appear, but if want your backend to receive a fixed host name, use:
proxy_set_header Host "your.fixed.hostname";