# Rack in Rails

**URL:** <https://www.ruby-forum.com/t/rack-in-rails/192270>\
**Category:** Rails\
**Created:** [July 27, 2010, 2:04pm UTC](https://www.ruby-forum.com/t/rack-in-rails/192270 "2010-07-27T14:04:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\
**Post date:** [July 27, 2010, 2:04pm UTC](https://www.ruby-forum.com/t/rack-in-rails/192270/1 "2010-07-27T14:04:43Z")

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Does Rack come with Rails or do I need to install the gem?

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**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\
**Post date:** [July 27, 2010, 5:35pm UTC](https://www.ruby-forum.com/t/rack-in-rails/192270/2 "2010-07-27T17:35:46Z")

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Robert W. wrote:

> Rack is a dependency of Rails so it will get installed when you install  
> the Rails gems. Also keep in mind certain versions of Rails requires a  
> certain version of Rack. Sometimes even an older one than the current.
> 
> If in doubt just run:
> 
> sudo gem install rails

How do I access rack from a rails app?

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**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\
**Post date:** [July 27, 2010, 3:01pm UTC](https://www.ruby-forum.com/t/rack-in-rails/192270/3 "2010-07-27T15:01:25Z")

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Pål Bergström wrote:

> Does Rack come with Rails or do I need to install the gem?

Rack is a dependency of Rails so it will get installed when you install  
the Rails gems. Also keep in mind certain versions of Rails requires a  
certain version of Rack. Sometimes even an older one than the current.

If in doubt just run:

sudo gem install rails

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**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\
**Post date:** [July 27, 2010, 6:36pm UTC](https://www.ruby-forum.com/t/rack-in-rails/192270/4 "2010-07-27T18:36:23Z")

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On Jul 27, 4:35 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> Robert W. wrote:
> 
> > Rack is a dependency of Rails so it will get installed when you install  
> > the Rails gems. Also keep in mind certain versions of Rails requires a  
> > certain version of Rack. Sometimes even an older one than the current.
> 
> > If in doubt just run:
> 
> > sudo gem install rails
> 
> How do I access rack from a rails app?

Typically, unless you were writing a metal or some rack middleware,  
you wouldn’t directly. Rack is (mostly) just the glue between the web  
server and rails

Fred