haproxy 如何配置 Access-Control-Allow-Private-Network

要在 HAProxy 中配置 `Access-Control-Allow-Private-Network`，需要使用 `http-response set-header` 选项。以下是一个示例配置：

frontend my_frontend
   bind *:80
   mode http
   http-response set-header Access-Control-Allow-Origin http://example.com
   http-response set-header Access-Control-Allow-Methods GET, POST, OPTIONS
   http-response set-header Access-Control-Allow-Headers Content-Type
   http-response set-header Access-Control-Allow-Credentials true
   http-response set-header Access-Control-Allow-Private-Network true
   default_backend my_backend

backend my_backend
   mode http
   server web-server1 192.168.0.1:8080

在上面的示例中，`http-response set-header Access-Control-Allow-Private-Network true` 配置告诉 HAProxy 允许对私有网络进行访问控制。可以根据需要修改其他选项。