server {
    listen       80;
    server_name  ngin服务器所对应的的域名;

    error_log  /data/logs/nginx/mainsite.error.log;
    access_log  /data/logs/nginx/mainsite.access.log  main;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;


    location / {
        ###设置跨域
        add_header Access-Control-Allow-Origin *; //这里最好不要用*，应该使用对应的域名。
        add_header Access-Control-Allow-Credentials true; 
        add_header Access-Control-Allow-Headers    "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With";
        proxy_pass http://mainsite; //代理转发的地址
        proxy_http_version 1.1;
        proxy_set_header Connection "";
    }

    error_page  404              /404.html;

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

        root   html;
    }
}