Method isStale

src/Common/HTTPConnectionPool.cpp:823–833

Detect connections that have been silently closed by the remote end. An idle keep-alive connection should have no data pending in the socket. If poll(SELECT_READ, 0) returns true on such a connection, it means the server has sent a FIN (or RST), so the next request on this connection would fail with "No message received" (NoMessageException).

    /// server has sent a FIN (or RST), so the next request on this connection
    /// would fail with "No message received" (NoMessageException).
    static bool isStale(Session & connection)
    {
        try
        {
            return connection.socket().poll(Poco::Timespan(0), Poco::Net::Socket::SELECT_READ);
        }
        catch (Poco::IOException &)
        {
            return true;
        }
    }


    ConnectionPtr prepareNewConnection(const ConnectionTimeouts & timeouts, UInt64 * connect_time)