How to make a single page in modx SSL Secure?

if ($modx->event->name == 'OnWebPageInit') { 
	//CONFIGURATION
	// server paths - no trailing slash!
	$secureserver = "https://fgm-factoring.de";
	$insecureserver = "http://fgm-factoring.de";
	$resourceId = $modx->resourceIdentifier;
	
	if ( intval($resourceId) ){ //exclude if not an id
	
		
		$encryption = FALSE;
		$urlType = 'http';
		$doc = $modx->getObject('modResource', $resourceId);
		$secure = $doc->getTVValue('encryption'); 
		if($secure=='1') {
			$encryption = TRUE;
			$urlType = 'https'; 
			} 
		$modx->setPlaceholder('urlType',$urlType);
		$url = $_SERVER['REQUEST_URI'];
		$ssl = FALSE;
		if($_SERVER['HTTPS'] == 1)  {
			    $ssl =  TRUE;
		} elseif ($_SERVER['HTTPS'] == 'on'){
			    $ssl =  TRUE;
		} elseif ($_SERVER['SERVER_PORT'] == 443) {
			$ssl = TRUE;
		}
		 
		// switch between http / https if necessary
		// if $secureserver === $insecureserver (eg you are testing locally)
		// then comment out this code block to avoid infinite recursion
		if($encryption && !$ssl) {
			 // if SSL off and we are about to access a secure page then redirect
			$modx->sendRedirect($secureserver.$url);
		} else if ($ssl && !$encryption) {
			// if SSL is on and we are about to acccess an unsecure page then redirect
			$modx->sendRedirect($insecureserver.$url);
		}
		
	}//exclude if not an id
}

if($modx->event->name == 'OnLoadWebDocument') {
   
    $encryption_value = $modx->resource->getTVValue('encryption');
    
    //finally the value
    $encryption = false;
    if($encryption_value == 1){
      $encryption = true;
    }
    
    $ssl = false;
    if($_SERVER['HTTPS'] == 1)  {
      $ssl = true;
    }
    elseif($_SERVER['HTTPS'] == 'on'){
      $ssl = true;
    }
    elseif($_SERVER['SERVER_PORT'] == 443) {
      $ssl = true;
    }
   
    // switch between http / https if necessary
    // if $secureserver === $insecureserver (eg you are testing locally)
    // then comment out this code block to avoid infinite recursion
    
    // if SSL is on and we are about to acccess an unsecure page then redirect
    if($ssl && !$encryption) {
     
      $url = $modx->makeUrl($modx->resource->get('id'), '', '', 'http');
      $modx->sendRedirect($url);
    }
    // if SSL off and we are about to access a secure page then redirect
    else if(!$ssl && $encryption) {
     
      $url = $modx->makeUrl($modx->resource->get('id'), '', '', 'https');
      $modx->sendRedirect($url);
    }
  }