enhancement(http provider): Add automatic bearer token acquisition in…

… http-client [version 2] (#21583)

* HTTP client auth as trait extension

* Use Client directly

* Unavailable oauth server should not crash vector

* Fix snafu error to by sync + send

* review fixes

* review fixes

* review fixes

* acquire token with oauth2 and mtls as described in rfc

* fix spell issues

* fix review comments

* fix review comments

* fix review comments

* fix review comments

* fix review comments

* vdev fmt

* vdev fmt

* review

* vdev fmt

* changelog

* changelog

* vdev fmt and check rust

* provide test for mtls scenario

* dd-rust-license-tool write

* dd-rust-license-tool write

* review comments

* fixes

* revert to expires_in

* review fixes

* review fixes

* generate-component-docs

* remove http component

* unable to expect a message under windows

Cargo.toml

@@ -414,6 +414,10 @@ vrl.workspace = true
 wiremock = "0.6.2"
 zstd = { version = "0.13.0", default-features = false }
 
+tokio-rustls = "0.23"
+rustls = "0.20"
+rustls-pemfile = "0.3"
+
 [patch.crates-io]
 # The upgrade for `tokio-util` >= 0.6.9 is blocked on https://github.com/vectordotdev/vector/issues/11257.
 tokio-util = { git = "https://github.com/vectordotdev/tokio", branch = "tokio-util-0.7.11-framed-read-continue-on-error" }

changelog.d/add_automatic_bearer_token_acquisition_in_http_client.enhancement.md

@@ -0,0 +1,4 @@
+The `http_client` can now acquire a bearer token using OAuth2 protocol, cache it and refresh before token expires.
+OAuth2 and mTLS extension are supported in this implementation.
+
+authors: KowalczykBartek