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24c76c6cb9
Adds support for MCP servers like StackOverflow that use OAuth but don't provide standard discovery metadata at .well-known endpoints. Changes: - Add fallback OAuth endpoints (/authorize, /token, /register) when discoverAuthorizationServerMetadata returns undefined - Add POST fallback in OAuth detection when HEAD returns non-401 (StackOverflow returns 405 for HEAD, 401 for POST) - Detect OAuth requirement from WWW-Authenticate: Bearer header even without resource_metadata URL - Add fallback /token endpoint for token refresh when metadata discovery fails - Add registration_endpoint to OAuthMetadata type This mirrors the MCP SDK's behavior where it gracefully falls back to default OAuth endpoint paths when .well-known metadata isn't available. Tests: - Add unit tests for detectOAuth.ts (POST fallback, Bearer detection) - Add unit tests for handler.ts (fallback metadata, fallback refresh) - Add StackOverflow to integration test servers Fixes OAuth flow for servers that: - Return 405 for HEAD requests (only support POST) - Return 401 with simple "Bearer" in WWW-Authenticate - Don't have .well-known/oauth-authorization-server endpoint - Use standard /authorize, /token, /register paths |
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