How to Retrieve the Final URL After HTTP Redirects in Go?

How to Get URLs After Client Directs

In Go's http package, making multiple http requests for querying strings is common. However, extracting these strings from the final URL can be challenging, especially when redirects occur. Unfortunately, the Response object lacks information regarding this final URL.

Despite the availability of redirect prevention options, this article focuses on obtaining the URL after a request has been made. To achieve this:

1. Create a new http request using http.NewRequest.
2. Set up an http.Client to handle the request.
3. Use an anonymous function to set up the client. The anonymous function allows for the URL query to be stored in a variable.
4. Execute the request using client.Do.
5. Retrieve the stored URL query.

Here's an example code snippet:

import (
    "fmt"
    "log"
    "net/http"
)

func main() {
    req, err := http.NewRequest("GET", "URL", nil)
    if err != nil {
        log.Fatal(err)
    }
    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\n", lastUrlQuery)
}

This code will redirect the request and will save the final URL query in lastUrlQuery.

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