How to Fix 'unsupported protocol scheme ''' Error in Go Basic Authentication?

HTTP Basic Authentication in Go: Troubleshooting a Common Error

While attempting to implement basic HTTP authentication with the provided code, an error arises: "unsupported protocol scheme ''". This can be traced back to an oversight in the code when creating the request object.

To address this error, ensure that the correct scheme is specified in the request URL. The example given attempts to make a request to "mydomain.example" without specifying a protocol scheme, which leads to the error.

To rectify this, modify the code to explicitly specify the HTTPS scheme as follows:

req, err := http.NewRequest("GET", "https://mydomain.example", nil)

Additionally, it's worth noting that Go's HTTP client may encounter another issue when handling redirects. By default, the client does not preserve custom headers, including the Basic Authorization header, during redirects.

To circumvent this behavior, you can define a custom redirect policy function that explicitly adds the Authorization header back during redirects. This ensures that the authentication credentials are preserved throughout the redirection process.

Here's an example of a custom redirect policy function:

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

By employing this custom policy in the HTTP client, you ensure that the Basic Authorization header is properly handled during redirects, allowing for seamless authentication.

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