在Nginx中返回503以获取POST请求

我有一个简单的配置文件,用于维护时自定义503错误页面.相关部分是这样的：

server {
    listen      80 default;
    root        /usr/share/nginx/html;
    server_name example.com;

    location / {
        if (-f $document_root/503.json) {
            return 503;
        }
    }

    # error 503 redirect to 503.json
    error_page 503 @maintenance;
    location @maintenance {
        rewrite ^(.*)$/503.json break;
    }
}

问题是Nginx发现任何请求都在静态文件中解析,任何POST,PUT和DELETE请求都得到405(方法不允许)响应.

所以问题是：如何告诉Nginx为任何HTTP方法提供页面服务？

The solution is to capture 405 errors in your @503 location block,serving
the maintenance page. In addition,you will have to enable
@recursiveerrorpages@,since you are first,intentionally,throwing a
503 error,and then the user is throwing a 405 by posting to your
static file:

recursive_error_pages on;

if (-f $document_root/system/maintenance.html) {
  return 503;
}

error_page 404 /404.html;
error_page 500 502 504 /500.html;
error_page 503 @503;
location @503 {

  error_page 405 = /system/maintenance.html;

  # Serve static assets if found.
  if (-f $request_filename) {
    break;
  }

  rewrite ^(.*)$/system/maintenance.html break;
}

资料来源：https://www.onehub.com/blog/2009/03/06/rails-maintenance-pages-done-right/

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