Christian Posta • 7/10/2025

MCP Authorization With Dynamic Client Registration

This article is a technical tutorial on implementing an MCP (Model Context Protocol) client with Dynamic Client Registration for OAuth, based on the MCP Authorization spec (2025-06-18). It details how an MCP client can automatically discover and register with an authorization server after receiving a 401 response, parsing WWW-Authenticate headers, and fetching resource metadata as per RFC 9728. The post is part of a series that includes building a spec-compliant MCP HTTP server and integrating a production Identity Provider like Keycloak.

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#http #Dynamic Client Registration #OAUTH 21