Facts about OAuth 2.0
- 08
Bearer tokens transmitted via OAuth 2.0 require HTTPS encryption to prevent interception, as unencrypted HTTP communication exposes user credentials and access tokens to network-based attacks.
- 07
Client credentials flow in OAuth 2.0 enables server-to-server authentication without user involvement, commonly used by backend applications accessing APIs with machine-to-machine authorization.
- 06
Most OAuth 2.0 implementations require the client secret parameter only on backend servers, as exposing it in frontend code would compromise application security across all connected user accounts.
- 05
Refresh tokens in OAuth 2.0 can persist for months or years, allowing applications to maintain long-term access to user resources without requiring repeated authentication.
- 04
The implicit flow grant type in OAuth 2.0 was deprecated in 2019 due to security vulnerabilities, with the authorization code flow with PKCE becoming the recommended alternative for single-page applications.
- 03
Authorization servers using OAuth 2.0 typically issue access tokens with lifespans between 15 minutes and 1 hour to balance security and user experience requirements.
- 02
Google, Facebook, Microsoft, and Amazon collectively handle over 90 percent of OAuth 2.0 authorization requests globally as major identity providers.
- 01
In 2012, the IETF finalized OAuth 2.0 as RFC 6749, replacing the original 2006 OAuth 1.0 protocol with simplified implementation requirements.