curl - HTTP Authorization Header

curl --user "user-id:password" http://www.google.com -v
> ...
> Authorization: Basic dXNlci1pZDpwYXNzd29yZA==
> ...

curl --user "user-id:password" --digest http://www.google.com -v
> ...
# Authorization Header not present in HTTP Request

curl --oauth2-bearer "BEARER_TOKEN" http://www.google.com -v
> ...
> Authorization: Bearer BEARER_TOKEN
> ...