Main domain: www.mysite.com

    1- http://www.mysite.com/string
       example:
       http://www.mysite.com/hw

    2- http://www.mysite.com/string/string
       example:
       http://www.mysite.com/hw/tablet

    3- http://www.mysite.com/string/number
       example:
       http://www.mysite.com/it/23234

    4- http://www.mysite.com/m/string/number
               example://m is a keyword
               http://www.mysite.com/m/tablet/12314

        5- http://www.mysite.com/archive/everything
           //archives is a keyword. anything in valid after that. for example:
           http://www.mysite.com/archive/12/4/2012
           http://www.mysite.com/archive/string
           http://www.mysite.com/archive/string