内部网路不能直接访问外网接口，可以通过代理发送HTTP请求。
HTTP代理服务需要进行认证。

package cmd

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
	"strings"
)

// 推送CBC07功能
func main() {
	log.Println("开启http代理服务...")
	proxyURL, err := url.Parse("http://username:password@proxyServerIp:port")
	if err != nil {
		fmt.Println("Failed to parse proxy URL:", err)
		// return err
		return
	}

	// 创建 HTTP 客户端并设置代理
	httpClient := &http.Client{
		Transport: &http.Transport{
			Proxy: http.ProxyURL(proxyURL),
		},
	}
	log.Println("开启请求推送...")
	urls := "https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=123456"
	method := "POST"

	payload := strings.NewReader(` 
				{
					"chatid": "CHATID",
					"msgtype":"image",
					"image":{
						"media_id": "media_id"
					},
					"safe":0
				} 
				
   `)

	log.Println("开启请求服务...")
	// client := &http.Client{}
	req, err := http.NewRequest(method, urls, payload)

	if err != nil {
		fmt.Println(err)
		return
	}
	req.Header.Add("Content-Type", "application/json")

	log.Println("执行请求中...")
	res, err := httpClient.Do(req)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer res.Body.Close()
	log.Println("读取响应：")
	body, err := ioutil.ReadAll(res.Body)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(string(body))
}