Nginx内部重定向循环与404错误排查求助（Apache反向代理场景）

问题现象 #

执行curl localhost:81/opt/soa/adminControl/v1/ro42/时，Nginx抛出错误：

rewrite or internal redirection cycle while internally redirecting to "/opt/soa/adminControl/v1/ro42/", client: 127.0.0.1, server: _, request: "GET /opt/soa/adminControl/v1/ro42/ HTTP/1.1", host: "localhost:81"

期望返回/opt/soa/adminControl/v1/ro42/目录下index.php（代码<?php echo "Hello";?>）的内容，但修改try_files配置为$uri$is_args$args =404;后返回404 Not Found。

当前架构 #

• Apache2监听80端口，作为反向代理将指定路径请求转发至监听81端口的Nginx
• Nginx通过fastcgi_pass 127.0.0.1:9000处理PHP请求

现有配置文件 #

File1: /etc/nginx/nginx.conf #

events {
worker_connections 1024;
}

http {
  access_log /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;

  server {
    listen 81 default_server;
    server_name _;

    location  /opt/soa/adminControl/v1/ro42 {
      try_files $uri $uri$is_args$args;
      include snippets/fastcgi-php.conf;
      fastcgi_pass 127.0.0.1:9000;
    }
  }
}

File2: /etc/apache2/sites-enabled/myPage.conf #

<VirtualHost *:80>

    ErrorLog ${APACHE_LOG_DIR}/errorVH.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined

    ServerName 54.172.180.152
    DocumentRoot /var/www/userExperience
    ProxyPass /opt/soa/adminControl/v1/ro42 http://localhost:81
    ProxyPassReverse /opt/soa/adminControl/v1/ro42 http://localhost:81

</VirtualHost>

错误原因分析 #

1. 重定向循环原因：原try_files $uri $uri$is_args$args;配置中，当请求/opt/soa/adminControl/v1/ro42/时，$uri匹配到该目录，但Nginx不会自动查找目录下的index.php，于是尝试第二个参数$uri$is_args$args（即原请求路径），导致重复匹配当前location，形成循环。
2. 404原因：修改为$uri$is_args$args =404;后，Nginx找不到匹配文件时直接返回404，未触发目录索引查找逻辑。
3. Apache代理配置问题：ProxyPass规则未保留完整路径，转发到Nginx时丢失了/opt/soa/adminControl/v1/ro42前缀，导致Nginx无法匹配对应的location块。

解决方法 #

1. 修正Apache代理配置 #

修改ProxyPass和ProxyPassReverse规则，添加末尾的/以保留完整请求路径：

ProxyPass /opt/soa/adminControl/v1/ro42/ http://localhost:81/opt/soa/adminControl/v1/ro42/
ProxyPassReverse /opt/soa/adminControl/v1/ro42/ http://localhost:81/opt/soa/adminControl/v1/ro42/

2. 修正Nginx的location与try_files配置 #

调整Nginx配置，添加目录索引并正确设置try_files，让Nginx访问目录时自动加载index.php：

location /opt/soa/adminControl/v1/ro42 {
    index index.php;
    try_files $uri $uri/ /opt/soa/adminControl/v1/ro42/index.php$is_args$args;
    include snippets/fastcgi-php.conf;
    fastcgi_pass 127.0.0.1:9000;
}

或简化写法（依赖index指令生效）：

location /opt/soa/adminControl/v1/ro42 {
    index index.php;
    try_files $uri $uri/ =404;
    include snippets/fastcgi-php.conf;
    fastcgi_pass 127.0.0.1:9000;
}

注意：确保/opt/soa/adminControl/v1/ro42/目录存在且Nginx有读取权限，index.php文件权限设置正确。

3. 重启服务使配置生效 #

systemctl restart apache2
systemctl restart nginx

内容的提问来源于stack exchange，提问作者eberteo