Authorization is an http.RoundTripper that makes HTTP requests, wrapping a base RoundTripper and adding an Authorization header with credentials.

BasicAuth is an http.RoundTripper that makes HTTP requests, wrapping a base RoundTripper and adding a Basic Authorization header.

BearerToken is an http.RoundTripper that makes HTTP requests, wrapping a base RoundTripper and adding an Authorization header with the Bearer Token.

Custom is an http.RoundTripper that can be used to implement custom HTTP request authorization.

PrivateToken is an http.RoundTripper that makes HTTP requests, wrapping a base RoundTripper and adding an Private-Token header with the GitLab personal token.