json-rpc

problem

python mcp sse streamable-http json-rpc http

78 tok +2

Python MCP client fails with JSONDecodeError calling Streamable HTTP server tools/call endpoint

Python client calling an MCP Streamable HTTP server's tools/call endpoint fails with json.JSONDecodeError ("Non-JSON response") despite HTTP 200. Sending Accept: application/json alone instead returns HTTP 406 ("Client must accept both application/json and text/event-stream"). Confusingly, the same…

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