Just For your information, It seems that Spray don't use Akka pipelines: 
https://groups.google.com/forum/#!topic/spray-user/CTPak-AgIjw

On Friday, January 17, 2014 11:28:17 PM UTC+1, Haoyi Li wrote:
>
> As someone who spent a while mucking around with Spray's pipelines, I must 
> say that despite their cool-ness, the clunkyness and unintuitiveness is 
> something I felt every day =)
>
>
> On Fri, Jan 17, 2014 at 2:07 PM, Rafał Krzewski 
> <[email protected]<javascript:>
> > wrote:
>
>> Wow, it's exciting to see these two concepts coming together! I liked the 
>> section on reactive streams in PORP course, (almost) as much the one actors 
>> :) 
>>
>> I'm wondering how this will influence release schedules though. If I 
>> understand things correctly, akka-io pipelines come from Spray, that is now 
>> being integrated into Akka as akka-http module. There were also plans to 
>> re-implement Akka remoting on top of akka-io instead of Netty, in order to 
>> build a top-to-bottom actor stack. On the other hand there were plans to 
>> integrate Spray / akka-io into Play framework replacing Netty. The new 
>> streams module will need some time to stabilize, and Spray / akka-http is 
>> up for a extensive rewrite right? This will surely push Play and remoting 
>> changes further on. 
>>
>> I know you guys are moving at an amazing pace, and routinely exceed 
>> everyone's expectations, but an update to roadmap document would really be 
>> helpful :)
>>
>> Cheers,
>> Rafał  
>>
>> W dniu czwartek, 16 stycznia 2014 23:08:34 UTC+1 użytkownik rkuhn napisał:
>>
>>> Dear hakkers,
>>>
>>> the first release candidate for Akka 2.3.0 is waiting just around the 
>>> corner, and as the subject says, the Pipeline infrastructure in our shiny 
>>> new Akka IO package, which was introduced in version 2.2.0, will be 
>>> discontinued. The whole IO subsystem was marked “experimental” throughout 
>>> the 2.2.x series and unfortunately this part of the experiment did not work 
>>> out: the API is just too clunky and unintuitive.
>>>
>>> We have something brewing which will be more than just a replacement for 
>>> Pipelines: inspired by RxJava we are working on implementing Reactive 
>>> Streams for Akka which will allow declarative transformation of streaming 
>>> data of all kinds, with proper handling of back-pressure and of course 
>>> fully typed. This will hopefully be available for preview in a few weeks 
>>> and it will be included in the 2.4 milestones as soon as it is ready. Doing 
>>> IO with this abstraction will be a breeze.
>>>
>>> So instead of keeping Pipelines in a zombie state and luring people into 
>>> their dead arms we decided to cull them early. For those of you who need 
>>> some fresh Akka but also want to stay on Pipelines for the time being we 
>>> will release a bugfix release 2.2.4 very soon as well.
>>>
>>> Regards,
>>>
>>>
>>> *Dr. Roland Kuhn*
>>> *Akka Tech Lead*
>>> Typesafe <http://typesafe.com/> – Reactive apps on the JVM.
>>> twitter: @rolandkuhn
>>> <http://twitter.com/#!/rolandkuhn>
>>>  
>>>  -- 
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>> >>>>>>>>>> Check the FAQ: http://akka.io/faq/
>> >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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>
>

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>>>>>>>>>>      Read the docs: http://akka.io/docs/
>>>>>>>>>>      Check the FAQ: http://akka.io/faq/
>>>>>>>>>>      Search the archives: https://groups.google.com/group/akka-user
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