# Functions
DownloadPackageFile serves the content of a package.
https://doc.rust-lang.org/cargo/reference/registries.html#owners-list.
https://rust-lang.github.io/rfcs/2789-sparse-index.html.
https://doc.rust-lang.org/cargo/reference/registries.html#search.
https://doc.rust-lang.org/cargo/reference/registries.html#unyank.
https://doc.rust-lang.org/cargo/reference/registries.html#publish.
https://doc.rust-lang.org/cargo/reference/registries.html#yank.
# Structs
https://doc.rust-lang.org/cargo/reference/registries.html#web-api.