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Set the timeout for the next logical operation.
void expires_after( net::steady_timer::duration expiry_time);
          This sets either the read timer, the write timer, or both timers to expire
          after the specified amount of time has elapsed. If a timer expires when
          the corresponding asynchronous operation is outstanding, the stream will
          be closed and any outstanding operations will complete with the error
          beast::error::timeout.
          Otherwise, if the timer expires while no operations are outstanding, and
          the expiraton is not set again, the next operation will time out immediately.
          The timer applies collectively to any asynchronous reads or writes initiated
          after the expiration is set, until the expiration is set again. A call
          to async_connect counts as both a
          read and a write.
        
| Name | Description | 
|---|---|
| 
                     | The amount of time after which a logical operation should be considered timed out. |