mPDF 7.0 requires PHP ^5.6 || ~7.0.0 || ~7.1.0 || ~7.2.0. PHP mbstring and gd extensions have to be loaded.
Additional extensions may be required for some advanced features such as zlib for compression of output and embedded resources such as fonts, bcmath for generating barcodes or xml for character set conversion and SVG handling.
mPDF has some problems with fetching external HTTP resources with single threaded servers such as php -S. A proper server such as nginx (php-fpm) or Apache is recommended.
Load balance : Server 04
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