How to Get the Final URL After Redirects in Go\'s `http.Client`?

Extracting the Final URL After Redirect in Http.Go

While using http.NewRequest to make HTTP requests, you may encounter the need to extract query strings from the final URL after any redirects. The Response object does not inherently provide access to the final URL.

To retrieve the URL after redirects:

1. Create an anonymous function within the CheckRedirect callback.
2. Within the anonymous function, set the lastUrlQuery variable to the RequestURI() of the redirected request.
3. Return nil to allow the redirect.

Here's a code snippet demonstrating this approach:

req, err = http.NewRequest("GET", URL, nil)
cl := http.Client{}
var lastUrlQuery string
cl.CheckRedirect = func(req *http.Request, via []*http.Request) error {
    if len(via) > 10 {
        return errors.New("too many redirects")
    }
    lastUrlQuery = req.URL.RequestURI()
    return nil
}
resp, err := cl.Do(req)
if err != nil {
    log.Fatal(err)
}
fmt.Printf("last url query is %v", lastUrlQuery)

By using this technique, you can capture the final URL after all redirects have occurred, allowing you to access query strings and other information from the final destination.

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