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609a41517b
This commit introduces manual read timer control as used by StreamDNS and its underlying transports. Before that, DoH code would rely on the timer control provided by TCP, which would reset the timer any time some data arrived. Now, the timer is restarted only when a full DNS message is processed in line with other DNS transports. That change is required because we should not stop the timer when reading from the network is paused due to throttling. We need a way to drop timed-out clients, particularly those who refuse to read the data we send.