Nginx 根據上游伺服器更改標頭

Question

我的環境中有 nginx 代理程式和 2 個上游（主要上游伺服器和備份上游伺服器）伺服器，目標是根據選取的上游變更「proxy_set_header Host X/Y」。

現在我只有一個想法，建立另一個 nginx 實例並將所有請求從我的代理程式傳送到該實例，重寫標頭並進一步傳送請求。

有誰知道更方便的解決方案？

這是我的簡化配置：

http {
access_log  /var/log/nginx/access.log  main;

sendfile            on;
tcp_nopush          on;
tcp_nodelay         on;
keepalive_timeout   65;
types_hash_max_size 2048;

include             /etc/nginx/mime.types;
default_type        application/octet-stream;

include /etc/nginx/conf.d/*.conf;

upstream images {
   server backend.test.com:8080 ;
   server backend-backup.test.com:8090 backup;
 }

server {
    listen       80 default_server;
    server_name  images-test.test.com;
    root         /usr/share/nginx/html;

    include /etc/nginx/default.d/*.conf;
 
    add_header                          Last-Modified "";
    add_header                          Pragma "public";
    add_header                          Access-Control-Allow-Origin $http_origin;

    error_page 404 /404.html;
    location = /404.html {}

    error_page 500 502 503 504 /50x.html;
    location = /50x.html {}


    location / {
  # some not related to the question lines deleted
          proxy_set_header Host "backend.test.com";
          proxy_pass http://images;
        }
}

}