Example of how to cache static HTML copies of MODX Resources using plugin + mod_rewrite

.htaccess

# Add this before your MODX Friendly URLs RewriteCond's and RewriteRule...
RewriteCond /abs/path/to/docroot/statcache%{REQUEST_URI} -f
RewriteRule ^(.*)$ /statcache/$1 [L,QSA]

plugin.StaticCache.php

<?php
switch ($modx->event->name) {
    case 'OnBeforeSaveWebPageCache':
        if ($modx->resource->_output != '') {
            $statcacheFile = $modx->getOption('statcache_path', $scriptProperties, MODX_BASE_PATH . 'statcache/') . $modx->makeUrl($modx->resource->get('id'));
            if (!$modx->cacheManager->writeFile($statcacheFile, $modx->resource->_output)) {
                $modx->log(modX::LOG_LEVEL_ERROR, "Error caching output from Resource {$modx->resource->get('id')} to static file {$statcacheFile}", '', __FUNCTION__, __FILE__, __LINE__);
            }
        }
        break;
}

Could you please explain how one would go about getting this to work - please :)