Common: avoid early deletion of handler When network_stream flushes input/output it destroy the handlers before continuing the block function. This leads in potential use-after-free results because client handlers may capture this as a shared_ptr which is deleted in the `pop_front` call. if (squeue_.front().second) squeue_.front().second(code); squeue_.pop_front(); // ^ ^ ^ Delete handler and possible capture of this sflush(); // ^ ^ ^ Possible use-after-free of `this`

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