how can we update crates index from specified url?

[miaomiao1992]

G:\Codebase\Rust\源码精读\axum-v0.6.20>cargo local-registry --sync Cargo.toml --no-delete C:/Users/Administrator/.cargo/local-registry
Blocking waiting for file lock on package cache
Updating crates.io index
warning: spurious network error (2 tries remaining): failed to send request: 操作超时
; class=Os (2)
warning: spurious network error (1 tries remaining): failed to send request: 操作超时
; class=Os (2)
error: failed to sync

Caused by:
failed to load pkg lockfile

Caused by:
failed to get hyper-util as a dependency of package example-hyper-1-0 v0.1.0 (G:\Codebase\Rust\源码精读\axum-v0.6.20\examples\hyper-1-0)

Caused by:
failed to load source for dependency hyper-util

Caused by:
Unable to update registry crates-io

Caused by:
failed to fetch https://github.com/rust-lang/crates.io-index

Caused by:
failed to send request: 操作超时
; class=Os (2)
请按任意键继续. . .

i want to update crates index from https://mirrors.ustc.edu.cn/crates.io-index but not https://github.com/rust-lang/crates.io-index.

[source.crates-io]
registry = "https://github.com/rust-lang/crates.io-index"
replace-with = 'ustc'
[source.ustc]
registry = "https://mirrors.ustc.edu.cn/crates.io-index"