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Change extraction method
Description
In our server environment, the "Document Root" could not be read correctly.
Instead of reading the document root via "$this->request->getParam('DOCUMENT_ROOT')", the following command worked:
$this->request->getServer('DOCUMENT_ROOT')
This is also used by the Magento core:
https://github.com/magento/magento2/blob/c3ab314c5e51cb91c96f161d82db92370cd7d9b8/app/code/Magento/Sitemap/Model/Sitemap.php#L766
It is possible that other parameters are also affected:
REMOTE_ADDR
HTTP_HOST
SERVER_NAME