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Hi @jonhoo,
I've added optional authorization for the HTTP registry. As with a "push", the "HTTP Authorization" header will be send on a index or crate download request.
Why: For private registry, authorization is not only important for the "push", but for the "pull" of any data, too. Different users can have different rights for crates. Sending an optional authorization header satisfies that need.
As this is my first time modifying Cargo, I'm sure I did a lot of stuff wrong or not optimal, so please let me know, where I can improve the code.
If there is generally no interest in support for authorization and private registries, let me know.