I've developed (still adding features too) a filter module that returns MD5 hashes the content, returning an extremely small digest message.
This I find very useful for checking the integrity of large files on media servers (as serving the whole content to a centralized checker is extremely expensive on network).
I realize, you could spin up your own file integrity checker, but on services with several servers handling the load of serving files, it's a lot easier to simply have a node or two query a bunch of hash locations and check against expected or historic values.

The source is at: http://github.com/kainswor/nginx_md5_filter

So my question is, how can I get this out there? I'd love to see it on the list of 3rd party modules ;)
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