# How can I read a cookie set on another subdomain by a non-Rails app? **URL:** \ **Category:** Rails\ **Created:** [May 22, 2009, 4:25pm UTC](https://www.ruby-forum.com/t/how-can-i-read-a-cookie-set-on-another-subdomain-by-a-non-rails-app/168577 "2009-05-22T16:25:26Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![andy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andy](https://www.ruby-forum.com/u/andy)\ **Post date:** [May 22, 2009, 4:25pm UTC](https://www.ruby-forum.com/t/how-can-i-read-a-cookie-set-on-another-subdomain-by-a-non-rails-app/168577/1 "2009-05-22T16:25:26Z")
I’m trying to build some single sign on functionality into our web application. There’s community site on a subdomain: i.e. [community.domain.com](http://community.domain.com) The Rails app is on: [www.domain.com](http://www.domain.com) When I inspect the cookies, I don’t see any of the “[community.domain.com](http://community.domain.com)” cookies. In “production.rb”, I have this: ActionController::CgiRequest::DEFAULT\_SESSION\_OPTIONS.update (:session\_domain =\> ‘.domain.com’) That doesn’t seem to help. How can I get my “www” app to read from the “community” subdomain? Thanks, Andy ---
**Author:** ![andy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andy](https://www.ruby-forum.com/u/andy)\ **Post date:** [May 22, 2009, 4:37pm UTC](https://www.ruby-forum.com/t/how-can-i-read-a-cookie-set-on-another-subdomain-by-a-non-rails-app/168577/2 "2009-05-22T16:37:46Z")
On May 22, 3:24 pm, Andy [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > In “production.rb”, I have this: > ActionController::CgiRequest::DEFAULT\_SESSION\_OPTIONS.update > (:session\_domain =\> ‘.domain.com’) > > That doesn’t seem to help. > > How can I get my “www” app to read from the “community” subdomain? what is the app setting the cookies doing ? if it’s setting them for [community.domain.com](http://community.domain.com) rather than .domain.com then you can’t get them because the browser won’t be sending them Fred ---
**Author:** ![andy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andy](https://www.ruby-forum.com/u/andy)\ **Post date:** [May 22, 2009, 5:02pm UTC](https://www.ruby-forum.com/t/how-can-i-read-a-cookie-set-on-another-subdomain-by-a-non-rails-app/168577/3 "2009-05-22T17:02:56Z")
I have no control over what the “[community.domain.com](http://community.domain.com)” server does. It’s a hosted application. So you’re saying that the browser won’t be sending cookies from “[community.domain.com](http://community.domain.com)” for use on other subdomains? Thanks, Andy On May 22, 10:37 am, Frederick C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![andy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/aeb1de/32.png) [@andy](https://www.ruby-forum.com/u/andy)\ **Post date:** [May 22, 2009, 5:40pm UTC](https://www.ruby-forum.com/t/how-can-i-read-a-cookie-set-on-another-subdomain-by-a-non-rails-app/168577/4 "2009-05-22T17:40:31Z")
On May 22, 4:01 pm, Andy [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I have no control over what the “[community.domain.com](http://community.domain.com)” server does. > It’s a hosted application. > > So you’re saying that the browser won’t be sending cookies from > “[community.domain.com](http://community.domain.com)” for use on other subdomains? correct (see [RFC 2965 - HTTP State Management Mechanism](http://tools.ietf.org/html/rfc2965) ) (unless the subdomain was [something.community.domain.com](http://something.community.domain.com)) Fred