编辑caddy配置文件，并写入以下配置

配置如下

domain {
    handle /bot* {
        reverse_proxy https://api.telegram.org {
            header_up Host api.telegram.org
            transport http {
                tls
                tls_insecure_skip_verify
            }
        }
    }

    handle / {
        respond "Telegram Bot API Proxy" 200
    }

    log {
        output file /var/log/caddy/tgapi.log
        format console
    }
}

caddy会自动处理证书，并开启https