Guide to Authorization Code Flow for OAuth 2.0

Guide to Authorization Code Flow for OAuth 2.0

This article will help you to understand the OAuth 2.0 authorization code flow.

Authorization Code Flow for OAuth 2.0

The OAuth 2.0 Authorization code flow is for web applications with server side components, which allow confidentiality for the customer to be kept on the permission server (confidential client). In general, permission servers need a secret when requesting authentication if more sensitive personal data, such as personal data or refresh tokens have been desired. If you don't, you will only obey the Implicit OAuth 2.0 flow which returns only an access token from the permit server.

In the Authorization Code flow, the server-side component of the web application can freely manage the user's session upon authenticating with the authorization server without revealing anything about the authorization server's response (such as personal data or refresh token) to the end-user.

A Typical Authorization Code Workflow:

  • The Client-Server attempts to access a resource that requires authorization that it does not have. It redirects the user to the authorization server for authentication.
  • By asking for your login credentials, the authorization servers authenticate the user. The server decides whether the user should be allowed or rejected.
  • If the user is legitimate, an authorisation code is given and sent back to the user client. This code is used to get the Authorisation Server access token.
  • The retrieved Authorization Code is sent to the Client-Server.
  • The Client-Server makes a POST request to the Authorization Server, containing its client key, secret, and Authorization Code.

You can read more in detail in this article about Authorization Code Flow for Auth 2.0:

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