The server-side error handling only checked for SseError instances
when detecting 401 responses from MCP servers. StreamableHTTPClientTransport
throws a different error type (generic Error with "HTTP 401" message)
when there's no authProvider configured.
This caused the proxy to return 500 instead of 401 to the client,
preventing the OAuth discovery and redirect flow from triggering.
Added is401Error() helper that checks for:
- SseError with code 401
- StreamableHTTPError with code 401
- Generic Error with "HTTP 401" or "(401)" in message
Fixes#960🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Clarify in contribution guidelines that during V2 development, V1
contributions should focus on bug fixes and MCP spec compliance.
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Co-Authored-By: Claude <noreply@anthropic.com>
1. createWebReadableStream: Add closed flag and cancel() callback to
prevent double-close crashes when SSE streams end. This fixes the
"Controller is already closed" error that occurs when the SDK calls
response.body.cancel() on 202 responses.
2. DELETE handler: Call serverTransport.close() after terminateSession()
to properly cleanup the transport and cancel pending reconnections.
- terminateSession() notifies the server (sends DELETE request)
- close() cleans up client-side resources (abort controller, timeouts)
- Both are needed for a complete disconnect
Guard against calling controller.close() when the stream has already
been closed by an external cancellation. This can happen when the SDK
cancels the stream before the underlying Node stream emits its 'end'
event.
- Add `closed` flag to track controller state
- Guard all controller operations with closed check
- Add `cancel()` callback to handle external cancellation
- Properly destroy the Node stream on cancellation
Version 0.17.3 had TypeScript build errors that prevented successful builds. This patch release fixes those errors and bumps the version to 0.17.4.
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Co-Authored-By: Claude <noreply@anthropic.com>
