CORS with OAuth and Authentication

1. OAuth

When using OAuth, you often deal with CORS because OAuth flows might involve multiple redirects and cross-origin requests:

• Redirect URIs: Ensure that your authorization server allows the origin of your application in its CORS configuration.
• State Parameter: Use the state parameter to maintain the security of the OAuth flow and prevent CSRF attacks.

2. JWT

When using JSON Web Tokens (JWT) for authentication, ensure the following:

• Credentials Configuration: If using cookies for storing JWTs, configure CORS to support credentials. This ensures that cookies are included in requests.
• Secure Headers: Verify that JWTs are sent in secure headers like Authorization and that CORS settings permit these headers.