Nginx configuration proxy directive setting problem

Question

{Code...} As above, when proxy_set_header is set to the same as the server name, a 502 error occurs. The error stack is as follows: upstream prematurely closed connection while reading response header from upstream, client: 127.0....

大家讲道理 · Answer

Your upstream is gone

習慣沉默 · Answer

CentOS7 installation and maintenance of Nginx, common usage scenarios

server {
  listen 80;
  server_name mydomain.com;
    
  location / {
    proxy_pass http://127.0.0.1:80;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host  $http_host;    
  } 
}

or this form

upstream server-a{
    # api 代理服务地址
    server 127.0.0.1:80;    
}
server {
    listen       80;
    server_name  mydomain.com;      # 这里指定域名
    # 匹配 api 路由的反向代理到API服务
    location ^~/ {
        rewrite ^/(.*)$ / break;
        proxy_pass http://server-a;
    }
}