GO web程序代理绑定域名非常频繁404的问题

用nginx做代理 配置文件如下：

server {
        listen 80;
        server_name leechan.online;

        location / {
            proxy_pass http://127.0.0.1:8888;
            proxy_http_version    1.1;
            #proxy_cache_bypass    $http_upgrade;
            proxy_set_header Upgrade            $http_upgrade;
            proxy_set_header Connection         "upgrade";
            proxy_set_header Host               $host;
            proxy_set_header X-Real-IP          $remote_addr;
            proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto  $scheme;
            proxy_set_header X-Forwarded-Host   $host;
            proxy_set_header X-Forwarded-Port   $server_port;
        }

        access_log    /home/wwwlogs/leechan.online.access.log;
}

但是经常出现404的情况，是非常频繁出现。 IP访问：http://117.50.7.147:8888 域名访问：http://leechan.online

各位大佬能指教一下是什么问题吗