我通常对货物没有任何问题，但有这个包装：
$ cargo build --verbose
Downloading hyper v0.9.1
unable to get packages from source
Caused by:
failed to download package `hyper v0.9.1` from https://crates.io/api/v1/crates/hyper/0.9.1/download
Caused by:
Timeout was reached
Hyper v0.9.1确实存在。我看到0.8也存在同样的问题。