In the SOCKET client sends a request, and receive the response from the server, if the server fails or network drops, etc., the client how to detect, on the server or network for troubleshooting after recovery, the client to establish a connection, make its normal work,

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And the server to keep the heart, the timeout automatically disconnect reconnection,

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How to keep the heart, to elaborate on it?

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Define the data structure of a test package, by every two seconds to send a client to the server, the server response for testing kits,

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If it is streaming socket, and to detect timeliness requirements is not high, can be done with the keepalive socket directly attribute, otherwise can only be done in the form of heartbeat packets,

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3 floor, 4th floor, can give a specific order code?