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fix: include transport path in protected resource metadata URL (RFC 9728) - #2665
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…endpoint When a client uses HTTP Basic authentication (RFC 6749 §2.3.1), its client_id and client_secret arrive in the Authorization header rather than the request body. ClientAuthenticator already validates Basic auth correctly for `client_secret_basic` clients, but it failed early with "Missing client_id" when client_id was absent from form data. TokenHandler also required client_id in form data for TokenRequest validation, causing a second failure path. Changes: - ClientAuthenticator.authenticate_request: extract client_id from Basic auth header when not present in form body, before the missing-id check - TokenHandler.handle: populate client_id from the already-authenticated client_info when absent from form data, so TokenRequest validates cleanly Two new tests cover the authorization_code and refresh_token grant flows with client_id supplied only via Authorization header. Fixes#1315 Signed-off-by: afischh <afischh@gmail.com>
…728) Per RFC 9728 §3, the `resource` field in `/.well-known/oauth-protected-resource` must identify the actual protected endpoint URL — e.g. `http://localhost:8000/mcp`, not the bare server base `http://localhost:8000/`. Without the path, VS Code Copilot and other spec-compliant clients reject the server with: Protected Resource Metadata resource "http://localhost:8000/" does not match MCP server resolved resource "http://localhost:8000/mcp" Fix: append `streamable_http_path` / `sse_path` to `resource_server_url` before passing it to `create_protected_resource_routes` and `build_resource_metadata_url` in both the lowlevel and mcpserver transports. Fixes#1264 Signed-off-by: Alex Fisch <afischh@gmail.com> Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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$(cat <<'EOF'
Summary
Fixes#1264
The
resourcefield in/.well-known/oauth-protected-resourcewas set to thebare
resource_server_url(e.g.http://localhost:8000/) instead of the actualprotected endpoint URL (e.g.
http://localhost:8000/mcp).Per RFC 9728 §3, the
resource identifier must match the URL that clients use to access the protected
resource. This caused VS Code Copilot (and other spec-compliant clients) to reject
the server with:
Changes
src/mcp/server/lowlevel/server.py: appendstreamable_http_pathtoresource_server_urlbefore passing it tocreate_protected_resource_routesand
build_resource_metadata_url.src/mcp/server/mcpserver/server.py: same fix forsse_path.tests/server/auth/test_protected_resource.py: 4 new tests verifyingthe URL construction and metadata response for
/mcpand/ssetransport paths.Tests
Note: PR #2189 (same fix, closed 2026-03-05 without merge) was used as reference
for the correct approach.
EOF
)