Fix MCP server authentication and logging issues#12
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rafalzawadzki merged 1 commit intomainfrom Feb 23, 2026
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- Enable JSON response mode to prevent SSE stream termination by server.close() - Handle GET/DELETE requests before transport creation (return 405 instead of confusing errors) - Remove API key prefix/suffix from error logs (security fix) - Change informational traces from console.error to console.log - Simplify error responses without leaking environment status This fixes Claude Code's "Authenticate" button showing up and "Failed to reconnect" errors. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Deploying with
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| Status | Name | Latest Commit | Updated (UTC) |
|---|---|---|---|
| ✅ Deployment successful! View logs |
supadata-mcp | 013cf8b | Feb 23 2026, 11:02 PM |
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Summary
Fixed two critical issues with the Cloudflare Worker MCP server preventing proper authentication and exposing sensitive data in logs.
Issue 1 – Claude Code shows "Authenticate" button: The transport was using SSE streaming responses, but
server.close()in the finally block terminated the stream before data was delivered. Now uses JSON response mode where responses are fully formed before cleanup.Issue 2 – API key leaked in error logs: Debug logging exposed the first/last 4 characters of the API key (
sd_a...f7c5) and was logged at error level in Cloudflare. Now only logs key length at log level, and removed environment status leaks from error responses.Changes
src/worker.ts: EnableenableJsonResponse: true, handle GET/DELETE before transport creation (return 405), remove API key logging, change console.error to console.warn for missing keys, clean up error responsessrc/mcp.ts: Change informational trace from console.error to console.log (line 9)package.json: Bump version to 1.2.2Testing
Verified locally with curl against wrangler dev:
initialize→ proper JSON-RPC response with capabilitiestools/list→ all 9 tools returnedtools/call→ reaches Supadata API successfullyGET /→ health check 200GET /mcp→ 405 (method not allowed, not confusing errors)🤖 Generated with Claude Code