RuntimeError: Unexpected ASGI message ‘http.response.start’ sent, after response already completed.

该报错通常出现在有状态 StreamableHTTPServerTransport 处理通知时:服务端已经完成 202 Accepted 响应,但随后向已关闭的会话 writer 转发通知失败,外层异常处理又尝试发送 500 ,从而触发第二轮 http.response.start 。优先排查 se








