server {
    listen       80;
    server_name  _;
    
    server_tokens off;
    location = /404.html {
        root /usr/share/nginx/html;
        internal;
    }

    #charset koi8-r;
    #access_log  /var/log/nginx/host.access.log  main;

    #add_header 'Access-Control-Allow-Origin' '*';  
    #add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, OPTIONS';  
    #add_header 'Access-Control-Allow-Headers' '*';  
    #add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';

    # add_header 'Access-Control-Allow-Origin' 'http://localhost:5678';
    add_header 'Access-Control-Allow-Origin' 'http://msa.js.sgcc.com.cn:6001';
    add_header 'Access-Control-Allow-Credentials' 'true';
    # add_header Cache-Control private;
    add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, PATCH, OPTIONS';
    add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Referer,Referrer-Policy';
    add_header 'Access-Control-Max-Age' '1728000';

    location / {
        if ($request_method = 'OPTIONS') {
    #            add_header 'Content-Type' 'text/plain charset=UTF-8';
    #            add_header 'Content-Length' '0';
                return 204;
        }
        proxy_pass  http://otel-collector-opentelemetry-collector.observe.svc.cluster.local:4318;
        proxy_set_header Host $host;  
        proxy_set_header X-Real-IP $remote_addr;  
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
}