View file system/vendor/ezyang/htmlpurifier/library/HTMLPurifier/URIFilter/DisableExternalResources.php

<?php

class HTMLPurifier_URIFilter_DisableExternalResources extends HTMLPurifier_URIFilter_DisableExternal
{
    /**
     * @type string
     */
    public $name = 'DisableExternalResources';

    /**
     * @param HTMLPurifier_URI $uri
     * @param HTMLPurifier_Config $config
     * @param HTMLPurifier_Context $context
     * @return bool
     */
    public function filter(&$uri, $config, $context)
    {
        if (!$context->get('EmbeddedURI', true)) {
            return true;
        }
        return parent::filter($uri, $config, $context);
    }
}

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