Ticket #9763: plugin.php

<?php
/*
 * Plugin Name: IdeaWebServer / LiteSpeed workaround
 * Plugin URI: http://core.trac.wordpress.org/ticket/9763
 * Description: Workaround for using WordPress on IdeaWebServer / LiteSpeed.
 * Author: Adam Harley
 * Author URI: http://adamharley.co.uk
 * Version: 0.1
*/


function is_apache_iws() {
        global $is_apache, $is_apache_workaround;

        if ( strpos($_SERVER['SERVER_SOFTWARE'], 'LiteSpeed') !== false || strpos($_SERVER['SERVER_SOFTWARE'], 'IdeaWebServer') !== false ) {
                $is_apache = true;
                $is_apache_workaround = true;
        } else {
                $is_apache_workaround = false;
        }
}

add_action( 'init', 'is_apache_iws', 1 );


function wp_redirect_iws( $location ) {
        global $is_apache_workaround;

        if ( $is_apache_workaround && '/' == $location[0] )
                $location = get_bloginfo('url') . $location;

        return $location;
}

add_filter( 'wp_redirect', 'wp_redirect_iws', 1 );