How to organize url contexts by address on modx revo?

Question

MODX

I welcome everyone!
I would like to implement it like this:
domain name.ru/test opens a new context when opened.
Made settings for the context:
Key: demo
base_url: /test
http_host:
domain name.ru/test site_start: 387
site_url http://domain name.ru/test
Plugin for OnHandleRequest event

<?php
if ($modx->context->key == 'mgr') {return;}

elseif ($modx->event->name == 'OnHandleRequest') {
  $var = $modx->getOption('request_param_alias', null, 'q');
  $request = $_REQUEST[$var];
  
  if (strpos($request, 'test') === 0) {
    $modx->switchContext('demo');
    
    $_REQUEST[$var] = substr($request, 8);
  }
}

But the error
503 Error
Page not found
The page you requested was not found gets out.
What could be the problem?

Answer 1

Thank you. I decided myself. It was necessary to properly configure htaccess and create a folder with 3 files, and this plugin can not be used.