Nginx proxy_pass和url重写

Question

两个nginx配置有什么区别

下面2个代码段给我相同的结果

Sample 1:
location /check  {
    rewrite    rewrite ^/check(.*) /$1 break;
    proxy_pass http://127.0.0.1;
}

Sample 2:
location /check {
    proxy_pass http://127.0.0.1/;

}