Nginx Hard Code Header Proxy to Next Server

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本文详细介绍了Nginx中proxy_set_header指令的使用方法，包括如何设置X-Real-IP、X-Forwarded-For等头部信息，以及如何根据HTTP用户代理进行条件性的代理传递。同时，文中还提供了具体的配置示例，展示了如何将流量转发到不同的目标服务器。

Nginx Hard Code Header Proxy to Next Server

Here is the syntax: proxy_set_header syntax: proxy_set_header header value;
Default: host and Connection
Context: http, server, location

I am using it here:
server {
listen localhost:8081;
client_max_body_size 10M;

# redirect pairing and status check traffic to aws lambda
resolver 10.0.80.11 10.0.80.12 8.8.8.8;
set $ocpServer 'https://two_web_site';
location / {
if ( $http_user_agent = 'oldclientsproxy' ) {
proxy_pass http://one_web_site:5080;
}
if ( $http_user_agent != 'oldclientsproxy' ) {
proxy_pass $ocpServer;
}
#for testing the header, comments out
#proxy_pass http://requestbin.fullcontact.com/195blks1;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Sillycat-Agent 'nginxproxy';
proxy_ssl_server_name on;
}

}

server {
listen localhost:xxxx;
location /nginx_status {
access_log off;
allow 127.0.0.1;
deny all;
}
}

References:
https://www.targetprocess.com/guide/installation/how-to-configure-proxy/
https://www.liaohuqiu.net/posts/nginx-proxy-pass/
https://serverfault.com/questions/304905/nginx-config-proxy-set-header