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  -### <a id='env'></a>Environment variables ###
  +### <a id='env'></a>Examine Environment Variables ###
   
   `cf push` deploys the application to a container on the server.
   The environment variables that reside in the container are the environment variables of your application.
  
positive.code: 
  ## <a id='domain'></a>Step 3: (Optional) Configure Domains ##
  
  Cloud Foundry directs requests to an application using a route, which is a URL made up of a subdomain and a domain.
  
  * The subdomain is also known as the host portion of the URL.
  The name of an application is the default subdomain for that application.
  
  * Every application is deployed to an application space that belongs to a domain.
  Every Cloud Foundry instance has a default domain defined.
  You can specify a non-default domain when deploying, provided that the domain is registered and is mapped to the
  organization which contains the target application space.
  
  For more information, see [About Domains, Subdomains and Routes](./domains-routes.html).
  
  
negative.code: Before you deploy your application to Cloud Foundry, make sure that:
  
  * Your application is *cloud-ready*.
  Cloud Foundry behaviors related to file storage, HTTP sessions, and port usage
  may require modifications to your application.
  
  * All required application resources are uploaded.
  For example, you may need to include a database driver.
  
  * Extraneous files and artifacts are excluded from upload.
  You should explicitly exclude extraneous files that reside within your
  application directory structure, particularly if your application is large.
  
  * An instance of every service that your application needs has been created.
  
  