Openresty/Lua 返回默认错误页面而不是自定义

Question

我目前正在尝试使用此脚本设置 WAF/DDOS 保护： https://github.com/C0nw0nk/Nginx-Lua-Anti-DDoS/blob/master/lua/anti_ddos_challenge.lua

如果其中一个 WAF 规则被命中，除了 openresty/nginx 返回默认的 500 错误页面而不是下面显示的自定义 error_page 之外，一切都运行良好。请参阅上面脚本中的“WAF_URI_Request_table”。

每次请求被这些 WAF 规则阻止时，我还会在我的日志中看到以下条目：

2020/07/27 09:20:29 [error] 150#150: *16 rewrite or internal redirection cycle while internally redirecting to "/403.html", client: 172.21.0.5, server: localhost, request: "GET /test.php HTTP/1.1", host: "localhost"

我的 nginx 配置看起来像这样（缩短）：

...
http {
     upstream backend {
        server 127.0.0.1:8000 max_fails=3 fail_timeout=60s;
     }
...
 server {
        listen 80;
        access_by_lua_file ddos_challenge.lua;
        aio threads=default;
...
location @proxy_to_app {
            proxy_pass http://backend;
            aio threads;
            proxy_read_timeout     100s;
            proxy_connect_timeout  100s;
            proxy_http_version 1.1;
            proxy_redirect off;
            proxy_buffers 16 4k;
            proxy_buffer_size 2k;
            proxy_intercept_errors on;
            proxy_set_header Host $host;
            uwsgi_intercept_errors on;
            gzip on;
            gzip_min_length 1024;
            gzip_comp_level 3;
            gzip_vary on;
            gzip_disable msie6;
            gzip_proxied expired no-cache no-store private auth;
            gzip_types text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml application/rss+xml application/atom+xml font/truetype font/opentype application/vnd.ms-fontobject image/svg+xml;
            }

location / {
            try_files $uri @proxy_to_app;
            }
...
error_page 412 414 416 444 495 496 497 500 501 502 504 507 /custom_error.html;
        location = /custom_error.html {
            root /app/templates/;
            internal;
        }

Answer 1

发现错误，见：

https://groups.google.com/g/openresty-en/c/1XASYFeP61o?pli=1

我将 access_by_lua 行移到 / 位置块，就是这样。