feat: add RFC 9728 OAuth2 resource metadata support #18920
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…mprovements Change-Id: I99fc71255165133bf858268030d39d2b1a71a288 Signed-off-by: Thomas Kosiewski <tk@coder.com>
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Enhanced OAuth2 and MCP Compliance for API Authentication
This PR improves OAuth2 and MCP (Microsoft Cloud for Sovereignty) compliance by:
WWW-Authenticateheaders with resource metadata URLsAccessURLto API key middleware for proper audience validationstateparameter optional in OAuth2 authorization requestsThese changes ensure proper OAuth2 token audience validation against the configured access URL and improve interoperability with OAuth2 clients by providing better error responses and metadata discovery.