设置 Webhook
https://api.telegram.org/bot{my_bot_token}/setWebhook?url={url_to_send_updates_to}
例如：
https://api.telegram.org/bot123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11/setWebhook?url=https://baicai.me
获取 Webhook
https://api.telegram.org/bot{my_bot_token}/getWebhookInfo