How to get a list of all redirects in http.Client?

Question

go

How can I get a nice list of all redirects? If, for example, when requesting page A, it redirects me to page B, and B, in turn, redirects to page C.

Answer 1

package main

import (
  "fmt"
  "net/http"
)

func main() {
  client := &http.Client{
    Transport: &http.Transport{},
    CheckRedirect: func(req *http.Request, via []*http.Request) error {
      if len(via) > 0 {
        fmt.Printf("%s -> %s\n", via[len(via)-1].URL.String(), req.URL.String())
      }
      return nil
    },
  }
  res, err := client.Get("...")
}

Answer 2

By “get a list of all redirects” I meant get a variable with a list that can then be used further.
Something like here (Java Apache HttpClient)

public List getAllRedirectLocations(String link) throws ClientProtocolException, IOException {
    List redirectLocations = null;
    CloseableHttpResponse response = null;

    try {
        HttpClientContext context = HttpClientContext.create();
        HttpGet httpGet = new HttpGet(link);
        response = httpClient.execute(httpGet, context);

        // get all redirection locations
        redirectLocations = context.getRedirectLocations();
    } finally {
        if(response != null) {
            response.close();
        }
    }

    return redirectLocations;
}

And you can just take it out like this

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
}