nginx 配置允许跨域

当前端页面和后端应用的协议、IP、端口有任意一项不一样时，就会出现跨域问题，对于这种情况我们可以在后端应用前加一个nginx ，在server{location/{ …}}中配置可以跨域

完整配置文件如下：

worker_processes  1;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
    server {
            listen       8090;
            server_name  localhost;
            location / {
                    add_header 'Access-Control-Allow-Origin' '*';
                    add_header 'Access-Control-Allow-Credentials' 'true';
                    proxy_pass http://10.18.35.246:30001;
                if ($request_method = OPTIONS){
                    add_header 'Access-Control-Allow-Origin' '*';
                    add_header 'Access-Control-Allow-Credentials' 'true';
                    add_header 'Access-Control-Max-Age' 1728000;
                    add_header 'Access-Control-Allow-Credentials' 'true';
                    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, DELETE';
                    add_header 'Access-Control-Allow-Headers' 'reqid, nid, host, x-real-ip, x-forwarded-ip, event-type, event-id, accept, content-type';
                    proxy_pass http://10.18.35.246:30001;
                    return 200;
                }
            }
            error_page   500 502 503 504  /50x.html;
            location = /50x.html {
            root   html;
            }
    }
    server {
        listen       8091;
        server_name  localhost;
        location / {
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Credentials' 'true';
                proxy_pass http://10.18.35.246:31001;
            if ($request_method = OPTIONS){
                add_header 'Access-Control-Allow-Origin' '*';
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Max-Age' 1728000;
                add_header 'Access-Control-Allow-Credentials' 'true';
                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS, DELETE';
                add_header 'Access-Control-Allow-Headers' 'reqid, nid, host, x-real-ip, x-forwarded-ip, event-type, event-id, accept, content-type';
                proxy_pass http://10.18.35.246:31001;
                return 200;
            }
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
        root   html;
        }
    }
    
}