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by est31 1340 days ago
There is some server side verification, mostly around checking that the dependencies all exist, the file isn't too large, etc. But 99% of the testing happens on the client.

Eg:

https://github.com/rust-lang/crates.io/blob/58e505f2abdabd6a...

https://github.com/rust-lang/crates.io/blob/58e505f2abdabd6a...

https://github.com/rust-lang/crates.io/blob/58e505f2abdabd6a...

https://github.com/rust-lang/crates.io/blob/58e505f2abdabd6a...