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Fix: an MCP client drops the Authorization header across a 308 cross-origin redirect and gets a 401

startdebugging.net · published 12 September 2026

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https://modelcontextprotocol.io/specification/2026-07-28/basic/authorization

modelcontextprotocol.io

https://claude.com/docs/connectors/building/troubleshooting

claude.com

https://github.com/whatwg/fetch/pull/1544

github.com

Fix: remote MCP server returns 401 invalid_token because the token's aud doesn't match the canonical server URL Read at the source ↗

startdebugging.net

https://github.com/modelcontextprotocol/python-sdk/issues/1168

github.com

Migrate an MCP Server from SSE to Streamable HTTP (2026 Checklist) Read at the source ↗

startdebugging.net

https://learn.microsoft.com/en-us/dotnet/api/system.net.http.httpclienthandler.allowautoredirect?view=net-10.0

learn.microsoft.com

https://github.com/dotnet/runtime/issues/122609

github.com

Fix: HTTP MCP Server URL Won't Connect in Claude Desktop (stdio vs HTTP Transport) Read at the source ↗

startdebugging.net

How to Route MCP Traffic Through a Gateway With the Mcp-Method and Mcp-Name Headers Read at the source ↗

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How to Build a Custom MCP Server in TypeScript That Wraps a CLI Read at the source ↗

startdebugging.net

How to Build a Custom MCP Server in Python with the Official SDK Read at the source ↗

startdebugging.net

https://github.com/whatwg/fetch/issues/944

github.com

https://github.com/nodejs/undici/security/advisories/GHSA-3787-6prv-h9w3

github.com