server

type Config struct {
	Addr           string        // e.g. ":8080"
	MaxDownloadMiB int64         // safety cap, default 1024 (1 GiB)
	MaxUploadMiB   int64         // safety cap, default 1024
	ReadTimeout    time.Duration // per request, default 60s — uploads can be large
	IPInfoToken    string        // optional ipinfo.io token for richer ISP data
}

type InfoResponse struct {
	ClientIP   string `json:"client_ip"`
	ISP        string `json:"isp,omitempty"`
	City       string `json:"city,omitempty"`
	Region     string `json:"region,omitempty"`
	Country    string `json:"country,omitempty"`
	ServerHost string `json:"server_host"`
	ServerTime string `json:"server_time"`
}