add_header Set-Cookie 'mycookie=xxxx;Path=/;SameSite=None; Secure';

Nginx配置完成版参考

upstream tomcat_server {
                server 127.0.0.1:8001  weight=10 max_fails=2 fail_timeout=30s;
}


log_format newmain '$remote_addr - "$http_x_forwarded_for" - "$http_j_forwarded_for" - $remote_user [$time_local]'
'"$request" $status $bytes_sent '
'"$http_referer" "$http_user_agent" '
'"$gzip_ratio"';
#限流模块
limit_req_zone $binary_remote_addr zone=ip_limit_index:20m rate=500000r/s;

server
{
      listen 80;

      server_name              www.xxx.com ;
     access_log               /export/xxx/nginx/logs/www.xxx.com/www.xxx.com_access.log main;
      error_log                /export/xxx/nginx/logs/www.xxx.com/www.xxx.com_error.log warn;
      error_page 411 = @error_page;

      root /export/App/www.xxx.com/;   
      
      location / {
    	  
        set $flag "flag";
         #如果是指定域名的请求，设置跨域
        if ($http_origin ~* "(xxx.com|xxx.cn)") {
            add_header 'Access-Control-Allow-Origin' "$http_origin";
          add_header 'Access-Control-Allow-Credentials' 'true';
          add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
          add_header 'Access-Control-Allow-Headers' 'Origin,X-Requested-With,Content-Type,Accept,Cache-Control,frLo';
          add_header 'Access-Control-Max-Age' 1728000;
        }
       
        #如果是预检请求，设置跨域后直接返回
        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' "$http_origin";
          add_header 'Access-Control-Allow-Credentials' 'true';
          add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
          add_header 'Access-Control-Allow-Headers' 'Origin,X-Requested-With,Content-Type,Accept,Cache-Control,frLo';
          add_header 'Access-Control-Max-Age' 1728000;
          #预检请求直接返回
          return 200;
        }
        
        
        proxy_next_upstream     http_500 http_502 http_503 http_504 error timeout invalid_header;
        proxy_set_header        Host  $host;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
        #设置cookie，当然也可以对以后的cookie追加SameSite=None; Secure配置
        add_header Set-Cookie 'mycookie=xxxx;Path=/;SameSite=None; Secure';
        proxy_pass              http://tomcat_server;
        expires                 0;
        fastcgi_buffer_size 128k;
		fastcgi_buffers 32 32k;
	}
		
		 
    #静态资源的处理
    location ~ .*\.(css|js|ico)$ {
		gzip on;
		gzip_min_length 1k;
		gzip_buffers 4 16k;
		gzip_comp_level 3;
		gzip_types text/plain application/x-javascript text/css application/xml text/javascript image/jpeg image/gif image/png image/x-icon;
		gzip_vary on;
		gzip_disable "MSIE [1-6]\.";
    }

    location /logs/ {
        autoindex       off;
        deny all;
    }  
     
}