Claude.ai's connector setup derives the protected-resource metadata URL
from the MCP server URL and fetches it before any 401 challenge:
/.well-known/oauth-protected-resource/api/extensions/ext/mcp-server/mcp
/api/extensions/ext/mcp-server/mcp/.well-known/oauth-protected-resource
Both were 404 (only the root document our WWW-Authenticate header points
at existed), which the dialog reported as "Authorization with Accounted
failed". One shared builder now serves all three locations; the
path-based route answers 404 for any path other than the MCP endpoint.
Claude-Session: https://claude.ai/code/session_018wCdzRTatKiDByKB8hCNT6
Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
