and `version`. This better suits HTTP/2 where the request line had to be synthesized from
    component headers.

 *  Breaking: Change `RecordedRequest.body` from a mutable `Buffer` to an immutable `ByteString`.

 *  Breaking: Adopt Okio's new `Socket` interface for `MockResponse.socketHandler`.

Note that any _Breaking_ changes above impact only APIs introduced in earlier 5.0.0-alpha releasees.

import okhttp3.testing.Flaky
import okhttp3.testing.PlatformRule
import okhttp3.tls.HandshakeCertificates
import okhttp3.tls.HeldCertificate
import okio.Buffer
import okio.BufferedSink
import okio.ByteString
import okio.ForwardingSource
import okio.GzipSink
import okio.Path.Companion.toPath
import okio.buffer
import okio.fakefilesystem.FakeFileSystem
import okio.use
import org.junit.jupiter.api.AfterEach

    that `tag()` now returns null if the request has no tag. Previously this would return the
    request itself.
 *  New: `Headers.Builder.addAll(Headers)`.
 *  New: `ResponseBody.create(MediaType, ByteString)`.
 *  New: Embed R8/ProGuard rules in the jar. These will be applied automatically by R8.
 *  Fix: Release the connection if `Authenticator` throws an exception.