请教以下配置有什么不同？

upstream baidu_server {
    server 180.149.132.47:80;
}
server {
    listen 80;
    server_name  xxx.example.com;
    charset utf-8;
    access_log off;

    location / {
        proxy_redirect off;
        proxy_pass http://baidu_server;
        proxy_set_header User-Agent $http_user_agent;
        proxy_set_header Accept-Encoding "";
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

server {
    listen 80;
    server_name  xxx.example.com;
    charset utf-8;
    access_log off;

    location / {
        proxy_redirect off;
        proxy_pass http://180.149.132.47:80;
        proxy_set_header User-Agent $http_user_agent;
        proxy_set_header Accept-Encoding "";
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }

第二种可以正确跳转到百度首页，第一种却不行，请问是为什么？