英文:
How to get the http redirect status codes
问题
我想要记录301和302重定向，但是在Client.Do、Get、doFollowingRedirects和CheckRedirect中，我看不到读取响应状态码的方法。我需要自己实现重定向来实现这个吗？
英文:
I'd like to log 301s vs 302s but can't see a way to read the response status code in Client.Do, Get, doFollowingRedirects, CheckRedirect. Will I have to implement redirection myself to achieve this?
答案1
得分: 13
http.Client 类型允许您指定自定义传输方式，这样您就可以实现您想要的功能。类似以下的代码应该可以实现：
type LogRedirects struct {
Transport http.RoundTripper
}
func (l LogRedirects) RoundTrip(req *http.Request) (resp *http.Response, err error) {
t := l.Transport
if t == nil {
t = http.DefaultTransport
}
resp, err = t.RoundTrip(req)
if err != nil {
return
}
switch resp.StatusCode {
case http.StatusMovedPermanently, http.StatusFound, http.StatusSeeOther, http.StatusTemporaryRedirect:
log.Println("请求", req.URL, "重定向，状态码为", resp.StatusCode)
}
return
}
（如果您只支持链接到默认传输方式，您可以简化这个代码块）。
然后，您可以使用这个传输方式创建一个客户端，任何重定向都会被记录：
client := &http.Client{Transport: LogRedirects{}}
这里有一个完整的示例供您参考：http://play.golang.org/p/8uf8Cn31HC
英文:
The http.Client type allows you to specify a custom transport, which should allow you to do what you're after. Something like the following should do:
type LogRedirects struct {
Transport http.RoundTripper
}
func (l LogRedirects) RoundTrip(req *http.Request) (resp *http.Response, err error) {
t := l.Transport
if t == nil {
t = http.DefaultTransport
}
resp, err = t.RoundTrip(req)
if err != nil {
return
}
switch resp.StatusCode {
case http.StatusMovedPermanently, http.StatusFound, http.StatusSeeOther, http.StatusTemporaryRedirect:
log.Println("Request for", req.URL, "redirected with status", resp.StatusCode)
}
return
}
(you could simplify this a little if you only support chaining to the default transport).
You can then create a client using this transport, and any redirects should be logged:
client := &http.Client{Transport: LogRedirects{}}
Here is a full example you can experiment with: http://play.golang.org/p/8uf8Cn31HC
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