My website's URLs are currently case-insensitive. For example, both of the following links show the exact same page:

• http://example.com/about
• http://example.com/About

However, taking a look at the wordpress.org website, I noticed that URLs are case-sensitive. For example, the second link below is a 404 error page:

• http://wordpress.org/about
• http://wordpress.org/About

My thoughts are to make my website's URLs case sensitive. Aside from the obvious issue of avoiding duplicate content, what are the pros and cons of having case-sensitive URLs?

Update

Google seems to operate a case-sensitive URL policy on their own URLs. For example, the second link below is a 404:

• http://google.com/doodles
• http://google.com/Doodles

Update 2

Thanks for your answers. I decided to take the advice mentioned in the accepted answer and implement 301 redirects where necessary. Since I'm working with WordPress, my code solution is as follows (in case anyone is interested):

function force_lowercase_urls() {
    
    if ( is_admin() )
        return;
    
    if ( preg_match( '/[A-Z]/', $_SERVER['REQUEST_URI'] ) ) {

        wp_redirect( strtolower( $_SERVER['REQUEST_URI'] ), 301 );
        exit();
    }
    
}
add_action( 'init', 'force_lowercase_urls' );