https://eunus.dev/tags/middleware/Recent content in Middleware onHugo -- gohugo.ioThu, 02 Jul 2026 00:00:00 +0600https://eunus.dev/blog/model-context-protocol-series-2b-the-bridge-middleware-that-lets-claude-debug-and-fix-its-own-tools/Thu, 02 Jul 2026 00:00:00 +0600https://eunus.dev/blog/model-context-protocol-series-2b-the-bridge-middleware-that-lets-claude-debug-and-fix-its-own-tools/Series 2A wired up the full OAuth 2.1 stack: discovery endpoints, mock Dynamic Client Registration, JWT validation, bearer token forwarding. Every piece of it works — right up until Claude Code opens the browser to log in, and OpenIddict slams the door: error: invalid_request error_description: The specified 'redirect_uri' is not valid for this client application. This post is about the one component that fixes it — a single bridge middleware — and why it earns its own post: it is the piece nobody else builds, because almost everyone tests their MCP OAuth against a client that never triggers the problem.