return cachingHashMap.size();
  }

  @Override
  public boolean isEmpty() {
    return cachingHashMap.isEmpty();
  }

  @Override
  public V get(Object key) {
    checkNotNull(key);
    Timestamped<V> value = cachingHashMap.get(key);

    if (value == null) {
      statsCounter.recordMisses(1);
      return null;
    } else if (!isExpired(value)) {
      statsCounter.recordHits(1);

	// The returned value can no longer be modified once returned.
	// Should be set before calling Get().
	updateFn func(ctx context.Context) (T, error)

	// ttl for a cached value.
	ttl time.Duration

	opts Opts

	// Once can be used to initialize values for lazy initialization.
	// Should be set before calling Get().
	Once sync.Once

	// Managed values.
	val          atomic.Pointer[T]
	lastUpdateMs atomic.Int64

		if opaURL == "" {
			return args, nil
		}
	}
	authToken := env.Get(EnvIamOpaAuthToken, "")
	if authToken == "" {
		authToken = env.Get(EnvPolicyOpaAuthToken, kv.Get(AuthToken))
	}

	u, err := xnet.ParseHTTPURL(opaURL)
	if err != nil {
		return args, err
	}
	args = Args{
		URL:         u,
		AuthToken:   authToken,
		Transport:   transport,

```Python hl_lines="6"
{!../../docs_src/first_steps/tutorial001.py!}
```
Декоратор `@app.get("/")` вказує **FastAPI**, що функція нижче, відповідає за обробку запитів, які надходять до неї:

* шлях `/`
* використовуючи <abbr title="an HTTP GET method"><code>get</code> операцію</abbr>

/// info | "`@decorator` Додаткова інформація"

Синтаксис `@something` у Python називається "декоратором".

    return form_data


@app.get("/users/me")
def read_users_me(current_user: Optional[User] = Depends(get_current_user)):
    if current_user is None:
        return {"msg": "Create an account first"}
    return current_user


client = TestClient(app)


def test_security_oauth2():
    response = client.get("/users/me", headers={"Authorization": "Bearer footokenbar"})

        final String proxyHost = (String) paramMap.get(Param.Client.PROXY_HOST);
        final String proxyPort = (String) paramMap.get(Param.Client.PROXY_PORT);
        if (StringUtil.isNotBlank(proxyHost) && StringUtil.isNotBlank(proxyPort)) {
            // proxy credentials
            if (paramMap.get(Param.Client.PROXY_USERNAME) != null && paramMap.get(Param.Client.PROXY_PASSWORD) != null) {

            result.setCreatedBy(DfTypeUtil.toString(source.get("createdBy")));
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setDuplicateHostName(DfTypeUtil.toString(source.get("duplicateHostName")));
            result.setRegularName(DfTypeUtil.toString(source.get("regularName")));
            result.setSortOrder(DfTypeUtil.toInteger(source.get("sortOrder")));

            result.setCreatedBy(DfTypeUtil.toString(source.get("createdBy")));
            result.setCreatedTime(DfTypeUtil.toLong(source.get("createdTime")));
            result.setName(DfTypeUtil.toString(source.get("name")));
            result.setUpdatedBy(DfTypeUtil.toString(source.get("updatedBy")));
            result.setUpdatedTime(DfTypeUtil.toLong(source.get("updatedTime")));

          public void run() {
            runCalled.getAndIncrement();
          }
        },
        directExecutor());
    list.execute();
    assertEquals(1, runCalled.get());
    list.execute();
    assertEquals(1, runCalled.get());
  }

  public void testExecute_idempotentConcurrently() throws InterruptedException {
    final CountDownLatch okayToRun = new CountDownLatch(1);

  @Test fun testIPv4() {
    val socket =
      FakeSocket(
        localAddress = InetAddress.getByAddress("127.0.0.1", byteArrayOf(127, 0, 0, 1)),
        localPort = 80,
      )
    val request = RecordedRequest("GET / HTTP/1.1", headers, emptyList(), 0, Buffer(), 0, socket)
    assertThat(request.requestUrl.toString()).isEqualTo("http://127.0.0.1/")
  }

  @Test fun testIpv6() {
    val socket =
      FakeSocket(