404.php

<?php
$search_term = untrailingslashit(substr($_SERVER['REQUEST_URI'],1));
$search_term = urldecode(stripslashes($search_term));
$find = array("'.html'", "'.+/'", "'[-/_]'");
$replace = " ";
$search_term = trim(preg_replace($find, $replace, $search_term));

// Sanitise the search term
global $wpdb;
$search_term_q = esc_js( $wpdb->escape( urlencode( strip_tags( $search_term ) ) ) );

//$redirect_location = get_home_url().'?s='.$search_term_q.'&search_404=1';
$redirect_location = get_home_url(null,'/','https').'?s='.$search_term_q.'&search_404=1';
get_header();
?>
<script type="text/javascript">
  jQuery(document).ready(function($){
    window.location.replace("<?php echo $redirect_location; ?>");
  });
</script>

<h1 class="page-title">
  <?php
    printf(__('Searching for: <span>%s</span>', 'hipoul'), $search_term_q );
  ?>
</h1>

<div class="post post_404">
  <div class="entry">
    <h2><?php _e('Error 404 - Page Not Found', 'hipoul'); ?></h2>
    <div class="entry-content">
      <p><?php _e("Sorry, I've looked everywhere but I can't find the page you're looking for.", 'hipoul'); ?></p>
      <p><?php _e("If you follow the link from another website, I may have removed or renamed the page some time ago. You may want to try searching for the page:", 'hipoul'); ?></p>
      
      <?php get_search_form(); ?>
    </div>
  </div>
</div>
<div class="post post_404_search">
  <div class="entry"> 
    <h2><?php _e('Automated search', 'hipoul'); ?></h2>   
    <div class="entry-content">
      <p>
      <?php printf(__('Searching for the terms <strong>%s</strong> ...', 'hipoul'), $search_term_q ); ?>
      </p>
    </div>
  </div>
</div>

<?php get_footer(); ?>