Interactive ruby ready.                                                      
>> help                                                                       
>> 2 + 6                                                                      
<?xml version="1.0" encoding="iso-8859-1"?>                                   
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"                
         "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">           
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">           
 <head>                                                                       
  <title>500 - Internal Server Error</title>                                  
 </head>                                                                      
 <body>                                                                       
  <h1>500 - Internal Server Error</h1>                                        
 </body>                                                                      
</html>                                                                       
>>