private var client = clientTestRule.newClient()

  @Test
  fun tagsSeededFromRequest() {
    val request =
      Request
        .Builder()
        .url("https://square.com/".toHttpUrl())
        .tag(Integer::class, 5 as Integer)
        .tag(String::class, "hello")
        .build()
    val call = client.newCall(request)

    // Check the Kotlin-focused APIs.
    assertThat(call.tag(String::class)).isEqualTo("hello")

            VersionRangeRequest request,
            Metadata.Nature wantedNature) {
        RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);

        Map<String, ArtifactRepository> versionIndex = new HashMap<>();

        Metadata metadata = new DefaultMetadata(
                request.getArtifact().getGroupId(),
                request.getArtifact().getArtifactId(),

            throws VersionResolutionException {
        RequestTrace trace = RequestTrace.newChild(request.getTrace(), request);

        Artifact artifact = request.getArtifact();

        String version = artifact.getVersion();

        VersionResult result = new VersionResult(request);

        Key cacheKey = null;

    }
  }

  @MapFeature.Require(ALLOWS_NULL_KEYS)
  @CollectionSize.Require(absent = ZERO)
  public void testGetOrDefault_nonNullWhenNullContained() {
    initMapWithNullKey();
    assertEquals(
        "getOrDefault(absent, default) should return default",
        v3(),
        getMap().getOrDefault(k3(), v3()));
  }

  @MapFeature.Require(ALLOWS_NULL_KEYS)
  @CollectionSize.Require(absent = ZERO)

これは、FastAPI に直接インポート/インクルードされるため、`fastapi` からインポートできる上に、`starlette.background`から別の `BackgroundTask` (末尾に `s` がない) を誤ってインポートすることを回避できます。

`BackgroundTasks`のみを使用することで (`BackgroundTask` ではなく)、`Request` オブジェクトを直接使用する場合と同様に、それを *path operations 関数* パラメーターとして使用し、**FastAPI** に残りの処理を任せることができます。

それでも、FastAPI で `BackgroundTask` を単独で使用することは可能ですが、コード内でオブジェクトを作成し、それを含むStarlette `Response` を返す必要があります。

    }

    upgrade()

    assertThat(server.takeRequest().connectionIndex).isEqualTo(0)
    assertThat(server.takeRequest().connectionIndex).isEqualTo(0)
  }

  @Test
  fun cannotReuseConnectionAfterUpgrade() {
    upgrade()

    server.enqueue(MockResponse(body = "normal request"))
    client.newCall(Request(server.url("/"))).execute().use { response ->

      mockServerClient
        .`when`(
          request()
            .withPath("/person")
            .withQueryStringParameter("name", "peter"),
        ).respond(response().withBody("Peter the person!"))

      val results =
        (1..20).map {
          executor.submit {
            val response =
              client.newCall(Request((mockServer.secureEndpoint + "/person?name=peter").toHttpUrl())).execute()

    assertThat(response.code).isEqualTo(0)
  }

  @Test fun defaultResponseBodyIsEmpty() {
    val response =
      Response
        .Builder()
        .request(
          Request
            .Builder()
            .url("https://example.com/")
            .build(),
        ).protocol(Protocol.HTTP_1_1)
        .code(200)
        .message("OK")
        .build()

import okhttp3.OkHttpClient
import okhttp3.Request

class PerCallSettings {
  private val client = OkHttpClient()

  fun run() {
    val request =
      Request
        .Builder()
        .url("http://httpbin.org/delay/1") // This URL is served with a 1 second delay.
        .build()

    // Copy to customize OkHttp for this request.
    val client1 =
      client
        .newBuilder()

 * <ul>
 *   <li>Debugging and troubleshooting request flows</li>
 *   <li>Audit logging of session operations</li>
 *   <li>Performance monitoring of nested operations</li>
 * </ul>
 *
 * @param context The context identifier for this request trace, helping to identify the scope or purpose
 *                of the request. May be null if no specific context is needed.