`@app.get("/")`は直下の関数が下記のリクエストの処理を担当することを**FastAPI**に伝えます:

* パス `/`
* <dfn title="HTTP GET メソッド"><code>get</code> オペレーション</dfn>

/// info | `@decorator` 情報

Pythonにおける`@something`シンタックスはデコレータと呼ばれます。

「デコレータ」は関数の上に置きます。かわいらしい装飾的な帽子のようです（この用語の由来はそこにあると思います）。

「デコレータ」は直下の関数を受け取り、それを使って何かを行います。

私たちの場合、このデコレーターは直下の関数が**オペレーション** `get`を使用した**パス** `/`に対応することを**FastAPI** に通知します。

    override fun channel(): String = "adhoc-%teamcity.build.branch%"

    override val type: PerformanceTestType
        get() = PerformanceTestType.AD_HOC

    override val failsStage: Boolean
        get() = false

    val buildSpecs: List<FlameGraphGenerationBuildSpec>
        get() =
            scenarios.flatMap { scenario ->
                Os.values().flatMap { os ->

  private final int size;
  private int position;

  /** Returns the element with the specified index. This method is called by {@link #next()}. */
  @ParametricNullness
  protected abstract E get(int index);

  /**
   * Constructs an iterator across a sequence of the given size whose initial position is 0. That
   * is, the first call to {@link #next()} will return the first element (or throw {@link

        synchronized (this.dcLock) {
            CacheEntry<DfsReferralDataInternal> ce = this.dcCache.get(dom);
            if (ce != null && System.currentTimeMillis() > ce.expiration) {
                ce = null;
            }
            if (ce != null) {
                final DfsReferralDataInternal ri = ce.map.get(DC_ENTRY);
                if (ri == NEGATIVE_ENTRY) {
                    return null;
                }

		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}

	userProvider := mux.Vars(r)["userProvider"]

	user := r.Form.Get("user")
	tokenRevokeType := r.Form.Get("tokenRevokeType")
	fullRevoke := r.Form.Get("fullRevoke") == "true"
	isTokenSelfRevoke := user == ""
	if !isTokenSelfRevoke {
		var err error
		user, err = getUserWithProvider(ctx, userProvider, user, false)

    assertThat(iia.get(0)).isEqualTo(0);
    assertThat(iia.get(2)).isEqualTo(3);
    assertThat(iia.subArray(1, 3).get(1)).isEqualTo(3);
  }

  public void testGet_bad() {
    ImmutableIntArray iia = ImmutableIntArray.of(0, 1, 3);
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(-1));
    assertThrows(IndexOutOfBoundsException.class, () -> iia.get(3));

  fun permitsRequestBody(method: String): Boolean = !(method == "GET" || method == "HEAD")

  fun redirectsWithBody(method: String): Boolean = method == "PROPFIND"

  fun redirectsToGet(method: String): Boolean = method != "PROPFIND"

  fun isCacheable(requestMethod: String): Boolean = requestMethod == "GET" || requestMethod == "QUERY"

	tw := tar.NewWriter(&buf)
	var files = []struct {
		Name, Body string
	}{
		{"readme.txt", "This archive contains some text files."},
		{"gopher.txt", "Gopher names:\nGeorge\nGeoffrey\nGonzo"},
		{"todo.txt", "Get animal handling license."},
	}
	for _, file := range files {
		hdr := &tar.Header{
			Name: file.Name,
			Mode: 0600,
			Size: int64(len(file.Body)),
		}
		if err := tw.WriteHeader(hdr); err != nil {

            final RESULT result = entityType.newInstance();
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setExpiredTime(DfTypeUtil.toLong(source.get("expiredTime")));
            result.setName(DfTypeUtil.toString(source.get("name")));
            result.setSessionId(DfTypeUtil.toString(source.get("sessionId")));
            return updateEntity(source, result);

                    status_text: str | None = status_code_ranges.get(
                        str(additional_status_code).upper()
                    ) or http.client.responses.get(int(additional_status_code))
                    description = (
                        process_response.get("description")
                        or openapi_response.get("description")
                        or status_text