How to Resolve 'unsupported protocol scheme ' Error During Basic HTTP Authentication in Go?

Basic HTTP Authentication in Go: Resolving Redirection Issues

When attempting basic HTTP authentication in Go using the provided code, developers may encounter the error: "unsupported protocol scheme ""." This error is likely due to the handling of redirects.

Gotcha and Resolution

The subtlety arises when the website performs redirection. In Go, during redirects, custom headers specified in the original request are lost. To address this, a custom redirect function must be defined to reinstate the headers.

Updated Code with Custom Redirect Function

The following code snippet illustrates the updated script that includes the redirect function:

func basicAuth(username, password string) string {
  auth := username + ":" + password
  return base64.StdEncoding.EncodeToString([]byte(auth))
}

func redirectPolicyFunc(req *http.Request, via []*http.Request) error{
  req.Header.Add("Authorization","Basic " + basicAuth("username1","password123"))
  return nil
}

func main() {
  client := &http.Client{
    Jar: cookieJar,
    CheckRedirect: redirectPolicyFunc,
  }

  req, err := http.NewRequest("GET", "http://localhost/", nil)
  req.Header.Add("Authorization","Basic " + basicAuth("username1","password123")) 
  resp, err := client.Do(req)
}

With this modification, the custom redirect function ensures that the authentication header is added to subsequent redirect requests, resolving the error and enabling HTTP authentication.

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