[BUG] Use HTTP standard for Authorization header

[mabolek]

Describe the bug

The authentication is currently using the format Authorization: [hash], where hash can either be a username/password pair separated by colon or a token.

To Reproduce

n/a

Expected behavior

• Password-based authentication should use Authorization: Basic [hash].
• Token-based authentication should use Authorization: Bearer [hash]

Additional context

More information:

Basic: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Authorization

Bearer: https://swagger.io/docs/specification/authentication/bearer-authentication/