Common HTTP headers

Authorization header

Basic format e.g. the basic auth

Usage: Authorization: Basic XXX

...where XXX is a string username:password encoded as Base64.

The browser will usually understand and save this format directly, e.g. you will not need to implement support for sessions in the client.

However, implementing features like sign out is much harder and the username and password will be stored plain text format.

Bearer format e.g. the token authentication

Usage: Authorization: Bearer TOKEN

...where TOKEN is authentication token from the backend.

Usually you'll get a token when you sign in.

To perform a request which must be authenticated later, you'll pass the token back to the server. This way, you don't need to save username and password

The token is often a JWT token. When working on the client side, you don't need to know much about the format.