• ' . $valid->get_error_message(); $data = $valid->get_error_data(); if ( is_wp_error( $data ) ) $message .= '
  • ' . $data->get_error_message() . '
  '; $message .= '

' . ''; wp_die( $message ); exit; } function _siteurl_is_valid($new, $old) { $_url = add_query_arg( 'testing-redirects', '1', $new ); $res = wp_remote_head($_url); if ( is_wp_error($res) ) return new WP_Error('unknown', __('WordPress cannot verify the suggested site URL'), $res ); if ( isset($res['headers']['wordpress-redirection']) && 'ok' == $res['headers']['wordpress-redirection'] ) wp_die( 'True:

' . print_r(array($_url,$res), true) );
	
	if ( isset($res['headers']['wordpress-redirection']) && 'not-front-page' == $res['headers']['wordpress-redirection'] )
		return new WP_Error('not_wordpress_front', __('The Provided URL does not resolve to the front page of WordPress.') );
	
	if ( '200' == $res['response']['code'] ) // Something exists, but is not the WordPress we expected.
		return new WP_Error('not_wordpress', __('This WordPress Installation was not accessable at that URL.') );

	if ( in_array( $res['response']['code'], array(300, 301, 302) ) ) // Redirection elsewhere.
		return new WP_Error('unknown', sprintf(__('Redirection to %s'), $res['headers']['location']) );

	wp_die( 'Fallthrough:
' . print_r(array($_url,$res), true) );
//	return true;
}

add_action('template_redirect', '_tr', 100);
function _tr() {
	if ( isset($_GET['testing-redirects']) ) {
		if ( is_front_page() )
			header('WordPress-Redirection: ok');
		else
			header('WordPress-Redirection: not-front-page');
		die();
	}
}