Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
MCPArea: what it touches
Bug FixesKind: in v2.1.265,
Bug FixesSection of the release
What
When posting to an MCP server's streaming endpoint (SSE, a way servers push data over an HTTP connection) fails with an HTTP 400, 404, or 405 status, Claude Code now looks inside the response body to check whether it's actually a harmless JSON-RPC response with a null ID, rather than a real connection failure.
Why
This avoids treating a technically error-coded but benign server response as a genuine connection problem, which should cut down on false failure reports for some MCP servers.
