streamable_http: early response.aclose() poisons keepalive connection, causes ~260ms latency on every subsequent tool call

用户在使用 MCP Python SDK (mcp==1.27.1) 的 streamable_http 传输模式时,通过 ClientSession.call_tool() 或 send_ping 、 list_tools 等调用,在 Windows 11 环境下发现问题。每次串行请求在单一连接上
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