Implementing OAuth 2.0 Authorization Code Flow with PKCE for SPA and Mobile Apps
Step-by-step guide to adding PKCE to the OAuth 2.0 Authorization Code flow, enabling secure token exchange for clients that cannot store a secret.
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Using PKCE to Secure Public Clients in OAuth 2.0
Learn how PKCE lets SPAs and mobile apps use the OAuth 2.0 authorization code flow without storing a client secret, and see a concrete curl‑based example.
Implement OAuth 2.0 Authorization Code Flow with PKCE in a Single‑Page App
Implement OAuth 2.0 Authorization Code Flow with PKCE in a single‑page app: register the client, generate code_challenge, handle redirects, exchange tokens, validate ID tokens, store securely, and rotate refresh tokens. Verify each step with network tools and CSRF tests.
How can I test the OAuth 2.0 authorization code flow with PKCE in a Delphi desktop app using a test Azure AD tenant without production credentials?
I need to verify that my Delphi VCL application can successfully obtain an access token from the Microsoft identity platform using the OAuth 2.0 authorization code flow with PKCE, while avoiding any use of production Azure AD credentials or real user data. The test environment must use a dedicated Azure AD test tenant, a localhost redirect URI that matches t
delphiRedirect URI Exact-Match Constraints in Ephemeral OAuth 2.0 Development Environments
Goal Establish a repeatable OAuth 2.0 Authorization Code flow with PKCE (RFC 7636) across containerized development environments where the authorization server and client applications start on dynamic ports or hostnames. Constraints and Uncertainty The OAuth 2.0 specification (RFC 6749) requires exact-match redirect URI validation. Most providers enforce thi
Limits on HTTP Redirect URIs for OAuth in Production vs Local Development
Goal: configure an OAuth client so that the same redirect URI value works in a local development environment (using http://localhost:8080/callback) and in a production environment where the provider requires an HTTPS URI that exactly matches the registered value, including any trailing slash or query parameters. Uncertainty: whether to enforce PKCE for all c
PKCE S256: Minimum code_verifier length enforcement in OAuth 2.0 authorization servers
When implementing the Proof Key for Code Exchange (PKCE) extension with the S256 challenge method, authorization servers must verify that the submitted code_verifier matches the previously stored code_challenge. While RFC 7636 recommends a code_verifier length of 43 to 128 characters using unreserved characters, many client libraries accept shorter values, a
OAuth Implicit Grant Deprecation: Transitioning to Authorization Code with PKCE
The goal is to maintain the ability to revert a client’s configuration from the authorization code flow with PKCE back to the deprecated implicit grant after a failed upgrade, while preserving existing sessions and tokens. Constraints include the absence of a defined deprecation window for the implicit grant in OAuth 2.0/2.1, the need to keep both grant type
OAuth 2.0 Implicit Flow to Authorization Code Flow with PKCE Transition
A small-scale application is upgrading its authentication mechanism to align with OAuth 2.1 standards by migrating from the deprecated Implicit Flow to the Authorization Code Flow with PKCE. The goal is to eliminate the exposure of access tokens in the URL fragment without introducing service downtime. The proposed strategy involves configuring the Authoriza