This feature is only supported in the Ultimate edition.
The following is only valid when Ruby Plugin is installed and enabled!
For each Rails application project, IntelliJ IDEA provides default Rails run/debug configurations for the production and development environments.
IntelliJ IDEA supports a number of Rails servers (Mongrel, WEBrick, Phusion Passenger, etc., depending on the specific platform).
Rails server runs in the dedicated tab of the Run tool window, named after the respective run/debug configuration. So doing, the server output is displayed in the Console tab, and the other information is displayed in the Server <environment type> log tab:

- Press ⌃⌥R⌥⇧F10⌃⌥R⌥⇧F10⌥⇧F10, and choose the desired Rails run/debug configuration type.
- If necessary, change the run/debug configuration settings. To do that, choose
in the Run popup menu, and choose the desired
Rails configuration type.
Rails run/debug configuration dialog box appears.
In this dialog box, modify the desired settings. For example, IntelliJ IDEA suggests WEBrick as the default Rails server. You can select a different server from the list of supported servers.
- Click the
button on the main toolbar.
You can opt to preview results of your Rails application immediately in a browser. For this purpose, change the selected Rails run/debug configuration to enable launching a built-in browser. To do it, select the Run browser checkbox, and specify the desired IP address.