Request to deregister this {@link Channel} from the previous assigned {@link EventExecutor} and notify the{@link ChannelFuture} once the operation completes, either because the operation was successful or because ofan error.
This will result in having the {@link ChannelOutboundHandler#deregister(ChannelHandlerContext,ChannelPromise)}method called of the next {@link ChannelOutboundHandler} contained in the {@link ChannelPipeline} of the{@link Channel}.
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