您将回调添加到
http.Client.CheckRedirect
// CheckRedirect specifies the policy for handling redirects. // If CheckRedirect is not nil, the client calls it before // following an HTTP redirect. The arguments req and via are // the upcoming request and the requests made already, oldest // first. If CheckRedirect returns an error, the Client's Get // method returns both the previous Response and // CheckRedirect's error (wrapped in a url.Error) instead of // issuing the Request req. // // If CheckRedirect is nil, the Client uses its default policy, // which is to stop after 10 consecutive requests. CheckRedirect func(req *Request, via []*Request) error
然后，您可以在发生新请求时对其进行检查。只要确保设置某种限制来防止重定向循环（如文档中所述，默认值在10点后中止）。
