Guys I am the maker of Express Cache. I am done with maintaining this module and moved from PS to WordPress/Shopify. I have open sourced it at https://github.com/ExpressTech/expresscache. Free free to fork and send PR if you want to.
PS: Fun fact, thirty bees copied a lot of express cache code line by line. You can checkout their full page caching code and compare it with mine. Its not a coincidence that mine stopped working and theirs too with new release of PS/TB :-)