Nginx非www转www配置异常导致WordPress REST API及回环请求故障求助

阿华AIGC实验室

2026-4-21

大家好，我最近碰到一个头疼的问题，想请各位帮忙分析下：我们的Nginx在配置非www转www的跳转后，WordPress后台出现了页面加载缓慢的情况，而且在Tools > Site Health里检测到两个关键错误，怀疑根源出在Nginx的配置上，具体情况如下：

问题背景

最初我们的Nginx配置是把example.com跳转到https://www.example.com，一开始正常工作。但自从Chrome在2021年默认启用HTTPS后，用户访问https://example.com时会出现SSL错误（因为我们只给www.example.com申请了证书）。

后来我们更新了Nginx配置来处理这个问题，但之后发现WordPress部分页面（包括wp-admin）加载变慢，调整memory_limit也没用。更关键的是，当WordPress的站点URL设置为www.example.com时，Site Health会报错；但如果设置为服务器IP，就完全正常，所以我推测是Nginx的跳转配置导致了问题。

当前Nginx配置（nginx.conf）

# Moves to HTTPS and serve certbot certificates
server {
    listen          80;
    server_name     example.com www.example.com app.example.com;

    location ~ /.well-known/acme-challenge/ {
        root    /var/www/certbot;
    }

    location / {
        return  301     https://$host$request_uri;
    }
}

# Includes www
server  {
    listen          443 ssl;
    server_name     example.com;

    error_log       /var/log/nginx/example.com.error.log;
    access_log      /var/log/nginx/example.com.access.log;

    ssl_certificate         /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key     /etc/letsencrypt/live/example.com/privkey.pem;
    ssl_dhparam             /etc/letsencrypt/dhparams.pem;

    return          301     https://www.example.com$request_uri;
}

# WordPress site
server  {
    listen          443 ssl;
    server_name     www.example.com;

    error_log       /var/log/nginx/www.example.com.error.log;
    access_log      /var/log/nginx/www.example.com.access.log;

    ssl_certificate         /etc/letsencrypt/live/www.example.com/fullchain.pem;
    ssl_certificate_key     /etc/letsencrypt/live/www.example.com/privkey.pem;
    ssl_dhparam             /etc/letsencrypt/dhparams.pem;

    location ^~ / {
        proxy_pass              http://10.0.0.131:80;
        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;
    }
}

server  {
    listen          443 ssl;
    server_name     app.example.com;

    error_log       /var/log/nginx/app.example.com.error.log;
    access_log      /var/log/nginx/app.example.com.access.log;

    ssl_certificate        /etc/letsencrypt/live/app.example.com/fullchain.pem;
    ssl_certificate_key    /etc/letsencrypt/live/app.example.com/privkey.pem;
    ssl_dhparam            /etc/letsencrypt/dhparams.pem;

    location ^~ / {
        proxy_pass              http://10.0.0.160:80;
        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;
    }

    error_page      400 401 402 403 404 500 502 503 504 =200                /error/unavailable.html;
    location = /error/unavailable.html {
        internal;
        alias /etc/nginx/html/error/;
        try_files /unavailable.html =404;
        access_log      /var/log/nginx/error.log;
    }
}

具体错误信息

在Site Health中检测到以下两个错误：

REST API异常
REST API Endpoint: https://www.example.com/index.php?rest_route=%2Fwp%2Fv2%2Ftypes%2Fpost&context=edit
REST API Response: (http_request_failed) cURL error 28: Connection timed out after 10000 milliseconds
回环请求失败
The loopback request to your site failed, this means features relying on them are not currently working as expected.
Error: cURL error 28: connection timed out after 10001 milliseconds (http_request_failed)

环境布局与排查进展

我们的架构是：

一台Proxmox服务器（IP：10.0.0.3）部署在防火墙设备（IP：10.0.0.1）之后
Proxmox上有两个容器：Nginx容器（10.0.0.125）和WordPress容器（10.0.0.131）
App服务器（10.0.0.160）部署在另一台独立机器上

已经做的排查：

关闭了所有防火墙：Proxmox集群级防火墙（pve-firewall stop）、容器上的UFW、WordPress的Wordfence插件
防火墙设备日志中没有看到任何拦截记录
Nginx和WordPress容器可以互相ping通，也能ping通Proxmox、防火墙接口和外部站点
查看了Wordfence的日志，没有找到和wp-json相关的请求记录

容器的hosts文件内容：

Nginx容器（10.0.0.125）/etc/hosts：

127.0.0.1       localhost
::1             localhost ip6-localhost ip6-loopback
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
# --- BEGIN PVE ---
10.0.0.125 nginx.local nginx
# --- END PVE ---

WordPress容器（10.0.0.131）/etc/hosts：

127.0.0.1       localhost
::1             localhost ip6-localhost ip6-loopback
ff02::1         ip6-allnodes
ff02::2         ip6-allrouters
# --- BEGIN PVE ---
10.0.0.131 example.com example
# --- END PVE ---

现在我实在找不到问题所在了，想请各位帮忙看看Nginx的配置哪里可能有问题，或者还有什么其他排查方向可以尝试？

备注：内容来源于stack exchange，提问作者rd1218