我正在制作网络爬虫。我将网址传递给搜寻器函数，并对其进行解析以获取锚标记中的所有链接，然后为所有这些网址使用相同的搜寻器函数，并对每个网址使用单独的goroutine。
但是，如果在我收到响应之前发送请求并取消它，则该特定请求的所有程序仍在运行。
现在我想要的是，当我取消请求时，由于该请求而被调用的所有goroutine都会停止。
请指导。
以下是我的 搜寻器 功能代码。

func crawler(c echo.Context, urlRec string, feed chan string, urlList *[]string, wg *sync.WaitGroup) {
    defer wg.Done()
    URL, _ := url.Parse(urlRec)
    response, err := http.Get(urlRec)
    if err != nil {
        log.Print(err)
        return
    }

    body := response.Body
    defer body.Close()

    tokenizer := html.NewTokenizer(body)
    flag := true
    for flag {
        tokenType := tokenizer.Next()
        switch {
        case tokenType == html.ErrorToken:
            flag = false
            break
        case tokenType == html.StartTagToken:
            token := tokenizer.Token()

            // Check if the token is an <a> tag
            isAnchor := token.Data == "a"
            if !isAnchor {
                continue
            }

            ok, urlHref := getReference(token)
            if !ok {
                continue
            }

            // Make sure the url begines in http**
            hasProto := strings.Index(urlHref, "http") == 0
            if hasProto {
                if !urlInURLList(urlHref, urlList) {
                    if strings.Contains(urlHref, URL.Host) {
                        *urlList = append(*urlList, urlHref)
                        // fmt.Println(urlHref)
                        // c.String(http.StatusOK, urlHref+"\n")Documents
                        if !checkExt(filepath.Ext(urlHref)) {
                            wg.Add(1)
                            go crawler(c, urlHref, feed, urlList, wg)
                        }
                    }
                }
            }
        }
    }
}

以下是我的POST请求处理程序

func scrapePOST(c echo.Context) error {
    var urlList []string
    urlSession := urlFound{}
    var wg sync.WaitGroup
    urlParam := c.FormValue("url")
    feed := make(chan string, 1000)
    wg.Add(1)
    go crawler(c, urlParam, feed, &urlList, &wg)
    wg.Wait()
    var count = 0
    for _, url := range urlList {
        if filepath.Ext(url) == ".jpg" || filepath.Ext(url) == ".jpeg" || filepath.Ext(url) == ".png" {
            urlSession.Images = append(urlSession.Images, url)
        } else if filepath.Ext(url) == ".doc" || filepath.Ext(url) == ".docx" || filepath.Ext(url) == ".pdf" || filepath.Ext(url) == ".ppt" {
            urlSession.Documents = append(urlSession.Documents, url)
        } else {
            urlSession.Links = append(urlSession.Links, url)
        }
        count = count + 1
    }
    urlSession.Count = count
    // jsonResp, _ := json.Marshal(urlSession)
    // fmt.Print(urlSession)
    return c.JSON(http.StatusOK, urlSession)
}