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Interesting note on the site is that these files don't need to be on the original server. Anyone can generate and host them.

> in fact, the .zsync can be generated and offered by a third party, while still leaving most of the download to the original distribution site.

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Interesting. How would that work for clients? If the destination file already exists on the client look for a .zsync on the hosting server, if its not there look for one at https://thirdpartyzsyncs.com?url=someurl ? What happens if the .zsync is out of sync with the resource?

The client, from my very limited testing, expects the url of the zsync file as an input. The zsync file can point to anywhere else for listing the canonical version.

So you'd zsync http://third-party/file.zsync and this file would contain the url for the main file.

> What happens if the .zsync is out of sync with the resource?

I'm not sure, I've not managed to get it working on a simple file yet.

my uninformed guess is that the zsync URL would be provided in some HTTP header

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