Rails - Apr 2014 - In Rails 4, how to achieve Edge Side Include and HTTP Cache Reverse Proxy behavior?

I'm from *Symfony2 PHP* and currently migrating to *Rails 4*, I have no 
knowledge with Rails 3 and before. I'm working on my web project with one 
last todo list to enable *dynamic caching* in this rails 4. In Symfony2 
there are built in function to setup *Edge Side Include* behavior 
effortless. Some of this functionality :


   - Sf2 have templating function to insert esi include tag <esi:include 
   src="http://..." /> with router name as parameter
   
http://symfony.com/doc/current/book/http_cache.html#using-edge-side-includes
> {{ render_esi(url('latest_news', { 'max': 5 })) }}


   - Sf2 have built in reverse proxy gateway to merge cached page which 
   have esi tag with corresponding response from each included esi tag url.
   
http://symfony.com/doc/current/book/http_cache.html#edge-side-includes
> Symfony2 comes with a reverse proxy (also called a gateway cache) written 
> in PHP. Enable it and cacheable responses from your application will start 
> to be cached right away. Installing it is just as easy. Each new Symfony2 
> application comes with a pre-configured caching kernel (AppCache) that 
> wraps the default one (AppKernel). The caching Kernel is the reverse proxy.

I have learning page, action, fragment cache. I also found *Rack::ESI*. I 
know there are *middleware* idiom, but I don't know what it's. I still
have
no idea how to setup all this info correctly. My esi tag doesn't replaced 
with corresponding response from esi tag url like in Sf2. I think this is 
because I haven't configured reverse proxy middleware in my Rails. So my 
question is, in Rails 4, how to achieve Edge Side Include and HTTP Cache 
Reverse Proxy behavior ?

Regards.

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