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POPreserving sessions when using multipe domain names for one Rails app
 

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  1. POPreserving sessions when using multipe domain names for one Rails app
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    <p>I have a single Rails 2.2.2 app that I want to 'share' with multiple clients. Each client has his own domain name and database. The purpose is to allow one Rails app to 'host' many websites.</p> <p>I am using Apache as a front end to a mongrel cluster, as the web server. To enable Rails to know which request is for which client, Apache adds a 'client_id' header to each request. Rails uses this 'client_id' to choose the correct database. </p> <p>This works perfectly well as long as I am only accessing it from one domain name at at time. Say 'example1.com'.</p> <p>It even works fine -- mostly -- when many users are accessing the application from multiple domain names at the same time.</p> <p>The one problem I have is that when two users are accessing the application from two domain names at the same time, then <strong>cookies are reset in an unexpected way</strong>.</p> <p>The problem is illustrated in the log snippet below:</p> <p>The 1st request is from User 1 logged into example1.com. </p> <p>The 2nd request is from User 2, for the example2.com home page.</p> <p>The 3rd request is from User 1, for another page in the application. Presumably, the request included the original cookie. <strong>The question is, why did Rails send a different cookie back???</strong></p> <p>Note that, unlike several other questions, <strong>I am not trying to share the same cookie across multiple domains.</strong> User 1 and User 2 in the example above are accessing different domains. </p> <p>-- John</p> <pre><code>**1st Request from USER 1 for example1.com** Processing Admin::CmsController#index (for 75.127.142.66 at 2009-01-27 13:15:27) [GET] Session ID: 00b9cfb6fd397e5c9934ea58eaef648d &gt;&gt;&gt; Request for client 90873721, EXAMPLE1.COM Rendering template within layouts/admin/standard Rendering admin/cms/list Completed in 114ms (View: 14, DB: 81) | 200 OK [https://example1.com/admin/cms] **2nd Request from User 2 for example2.com** Processing CmsController#cms_show (for 64.1.215.163 at 2009-01-27 13:16:15) [GET] Session ID: 4fed1c59001f7484a63fb6280376825a Parameters: {"alias"=&gt;"home.html"} &gt;&gt;&gt; Request for client 48218343, EXAMPLE2.COM ### alias: home.html Rendering template within layouts/two-column Rendering cms/cms_show Completed in 23ms (View: 13, DB: 3) | 200 OK [http://example2.com/] **3rd Request from User 1 for example1.com -- note session ID changes!!!** Processing Admin::CmsController#index (for 75.127.142.66 at 2009-01-27 13:16:18) [GET] Session ID: 85c178aa70ed2bef6a767e844bf6c6d6 &gt;&gt;&gt; Request for client 90873721, EXAMPLE1.COM ####### 'admin/cms', 'index' Redirected to actionsignincontroller/admin/user Filter chain halted as [:check_authentication] rendered_or_redirected. Completed in 4ms | 302 Found [https://example1.com/admin/cms] **4th request -- redirected from 3rd request** Processing Admin::UserController#signin (for 75.127.142.66 at 2009-01-27 13:16:18) [GET] Session ID: 85c178aa70ed2bef6a767e844bf6c6d6 &gt;&gt;&gt; Request for client 90873721, EXAMPLE1.COM Rendering template within layouts/admin/standard Rendering admin/user/signin Completed in 10ms (View: 6, DB: 0) | 200 OK [https://example1.com/admin/user/signin] </code></pre>
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