go语言 调用飞书群消息机器人接口

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package main   import (   "flag"   "fmt"   "net/http"   "strings" )   func sendMsg(apiUrl, msg string) {   // json   contentType := "application/json"   // data   sendData := `{     "msg_type": "text",     "content": {"text": "` + "消息通知:" + msg + `"}   }`   // request   result, err := http.Post(apiUrl, contentType, strings.NewReader(sendData))   if err != nil {     fmt.Printf("post failed, err:%v\n", err)     return   }   defer result.Body.Close()   }   func main() {   // webhook地址   var webhookUrl string   // 消息内容   var message string     flag.StringVar(&webhookUrl, "u", "", "飞书webhook地址")   flag.StringVar(&message, "s", "", "需要发送的消息内容")     flag.Parse()   flag.Usage()   sendMsg(webhookUrl, message) }