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first, and we do not not care whether client has received all data. This is a TCP optimization to avoid TIME_WAIT in TCP connection teardown. This patch would abort connection on timeout, which usually happens when client reads a large result set, at slower pace then the server can write. The patch also cleans up socket timeout handling, so that Windows is consistent with another platforms (using nonblocking socket IO + waiting in poll/select on single socket, rather than setsockopt). This makes identifying timeouts easier. Also removed the superficial shutdown() before closesocket() in a few places where it was used, because it was never needed , and reportedly breaks SO_LINGER on Windows.