新学go使用http request的内存溢出问题

使用了beego框架用toolbox.NewTask定时去执行一个func. func代码如下 func Bocais() error { //fmt.Println(time.Now().Format("2006/1/2 15:04:05")) url := "https://www.7454cc.com/Lottery/Autocqssc" payload := strings.NewReader("------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"__RequestVerificationToken\"\r\n\r\ns3G01KZ8H9YSlU_HwS-5AUVZHMotO8Hta0SzQ12BJIHl7GspdCu8L4CoCjvDk2wt_tgvEt7xGIbBtMjy0xJTomJ0hoe9JxHIbLSIavfMDn-WmxE_GCY_rtZoBNfcZiQ7CU9agpxbxdg0zyBwTmM5xkK-1bvNgIibpslBBSL6FE41\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"class1\"\r\n\r\n1\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("content-type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW") req.Header.Add("Accept", "application/json") req.Header.Add("Cookie", "ASP.NET_SessionId=onab1ylbwmez1ld5j420r0n5; __RequestVerificationToken=mKcx8gEZ7M66CZa6Uqm9VhQfuc79iQqqaZZ1FFIZwYYlFuLyvEqeA_a3Z145PxiCSIf73QOk-jsOtUir1gHnNjdTFAR-kxLZXWTy2MAJGhRYTfPUFuPYvgo0KRw61DjHZAMAqEvURVlXYxXgh4OJOg2") req.Header.Add("cache-control", "no-cache") res, err := http.DefaultClient.Do(req) defer res.Body.Close() if err != nil { fmt.Println("http请求失败") return err } body, err := ioutil.ReadAll(res.Body) if err != nil { fmt.Println("body解析失败:" + string(body[:])) return err } e := controllers.BocaiCache(body) if e != nil { fmt.Println(e) } return nil } BocaiCache方法如下 var i = 0 var number = "" func BocaiCache(body []byte) error { i++ fmt.Println(i) exp := regexp.MustCompile(`"hm":\[(.+)\],`) result1 := exp.FindAllSubmatch(body, -1) str := string(result1[0][1]) if number != str { fmt.Print("oldNumber:"+number+"->newNumber:"+str) number = str } return nil } 运行了大概一个半小时报错 panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x40 pc=0x827177] goroutine 3869 [running]: main.Bocais(0x0, 0x0) C:/Users/Administrator/Desktop/go/src/bocai/main.go:37 +0x1d7 github.com/astaxie/beego/toolbox.(*Task).Run(0xc42011c180, 0xbf2580, 0x6e96bccddb4) C:/Users/Administrator/Desktop/go/src/github.com/astaxie/beego/toolbox/task.go:143 +0x32 created by github.com/astaxie/beego/toolbox.run C:/Users/Administrator/Desktop/go/src/github.com/astaxie/beego/toolbox/task.go:424 +0x1fd 截图如下    请大神解惑 不胜感激