Rust编译`Couldn‘t resolve host name (Could not resolve host: crates)` 错误的解决办法

在编译Rust源程序时，可能会出现如下 Couldn't resolve host name (Could not resolve host: crates) 错误（见 https://github.com/ustclug/discussions/issues/294）。

root $ cargo check
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)Downloaded actix-http v1.0.1 (registry `git://mirrors.ustc.edu.cn/crates.io-index`)
warning: spurious network error (2 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)Downloaded async-trait v0.1.30 (registry `git://mirrors.ustc.edu.cn/crates.io-index`)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)Downloaded chrono v0.4.11 (registry `git://mirrors.ustc.edu.cn/crates.io-index`)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
warning: spurious network error (1 tries remaining): [6] Couldn't resolve host name (Could not resolve host: crates)
error: failed to download from `https://crates-io.proxy.ustclug.org/api/v1/crates/futures-macro/0.3.4/download`Caused by:[6] Couldn't resolve host name (Could not resolve host: crates)

一个临时的解决方法是在运行 cargo 的时候加入环境变量 CARGO_HTTP_MULTIPLEXING=false。作用是取消并行下载。具体原因可参考用了镜像之后构建rustc报错。

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Rust编译`Couldn‘t resolve host name (Could not resolve host: crates)` 错误的解决办法

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