Rails, Subdomain based cookies

I have a rails application which is Subdomain based. It also contains REST API which can be publicly accessed to our clients. I have an another client application through which I am accessing the REST API of the main app.

When I am accessing both the apps on the same browser and logged in the main app, I am not able to access the REST API of different Subdomain in client app as cookie get stored according to the domain accessed.

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Is there any way to differentiate the cookies based on Subdomain.

Thanks in advance.

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You should set cookie's domain as .yourdomain.com so that your cookies are set for main domain and for all subdomains.

Rails 3 on config/initializers/session_store.rb:

Rails.application.config.session_store :cookie_store, :key => '_my_key', :domain => ".yourdomain.com"

Rails 2.3+ on config/environment.rb:

config.action_controller.session = { :key => '_my_key', :domain => '.yourdomain.com' }