Add post to call for testing of Cargo's -Zhttp-registry

posts/inside-rust/2022-06-16-http-registry-testing.md

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+---
+layout: post
+title: "Cargo http-registry call for testing"
+author: Arlo Siemsen
+team: The Cargo Team <https://www.rust-lang.org/governance/teams/dev-tools#cargo>
+---
+
+The Cargo `http-registry` feature is ready for testing. The feature causes Cargo
+to access the crates.io index over http, rather than git. It can provide a significant
+performance improvement, especially if the git index is out-of-date or not yet cloned.
+
+To try it out, add the `-Zhttp-registry` flag on the `nightly-2022-06-09` or newer
+build of Cargo. For example, to update dependencies:
+
+```
+rustup update nightly
+cargo +nightly -Zhttp-registry update
+```
+
+You can leave feedback on the [internals thread][internals].
+
+Accessing the index over http allows crates.io to continue growing without hampering
+performance. The improvement should be especially noticeable in CI environments, where
+no local cache of the index exists.
+
+The Cargo team plans to eventually make this the default (though the git index will
+remain for compatibility with older Cargo and external tools).
+
+The `-Zhttp-registry` flag also enables alternative registries to be accessed over
+http. For more details, see the [tracking issue][issue].
+
+
+[internals]: https://internals.rust-lang.org/t/xxxxxxxxxxxxxxxxxxxxxxxxx
+[issue]: https://github.com/rust-lang/cargo/issues/9069