Why Does Go HTTP Authentication Fail with 'unsupported protocol scheme '''?

Basic HTTP Authentication in Go: Resolving an Error Code

In attempting basic HTTP authentication with Go, you may encounter the error message "unsupported protocol scheme ''". Let's delve into the code and explore why this issue arises.

The problematic code is as follows:

func basicAuth() string {
    req, err := http.NewRequest("GET", "mydomain.example", nil)

The error stems from omitting the "http://" or "https://" prefix in the URL. To address this, modify the code to:

func basicAuth() string {
    req, err := http.NewRequest("GET", "http://mydomain.example", nil)

Ensure that the URL you provide includes the correct protocol scheme, either "http" or "https".

Additional Gotcha: Redirects

Be aware of a potential pitfall involving redirects. Go-lang discards specified headers during redirects. To overcome this, implement a custom redirect policy function that re-adds the header:

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

Incorporate the custom redirect policy into your client:

client := &http.Client{
  CheckRedirect: redirectPolicyFunc,
}

By following these adjustments, you can successfully perform basic HTTP authentication in Go and handle potential redirects without losing your authorization header.

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