* they crawl the page. Valid values are:
     * <ul>
     * <li>always</li>
     * <li>hourly</li>
     * <li>daily</li>
     * <li>weekly</li>
     * <li>monthly</li>
     * <li>yearly</li>
     * <li>never</li>
     * </ul>
     * The value "always" should be used to describe documents that change each
     * time they are accessed. The value "never" should be used to describe
     * archived URLs.

    protected static final int MAX_URL_LENGTH = 2048;

    /** Valid changefreq values. */
    protected static final String[] VALID_CHANGEFREQ = { "always", "hourly", "daily", "weekly", "monthly", "yearly", "never" };

    /**
     * Creates a new SitemapsHelper instance.
     */
    public SitemapsHelper() {
        // Default constructor
    }

    /**

        assertTrue(sitemapsHelper.isValidChangefreq("weekly"));
        assertTrue(sitemapsHelper.isValidChangefreq("monthly"));
        assertTrue(sitemapsHelper.isValidChangefreq("yearly"));
        assertTrue(sitemapsHelper.isValidChangefreq("never"));
        assertTrue(sitemapsHelper.isValidChangefreq(null));
        assertTrue(sitemapsHelper.isValidChangefreq(""));

        // Invalid changefreq

If you have a different use case that needs to exit early from a dependency with `yield`, please create a <a href="https://github.com/fastapi/fastapi/discussions/new?category=questions" class="external-link" target="_blank">GitHub Discussion Question</a> with your specific use case and why you would benefit from having early closing for dependencies with `yield`.

///

## Early exit and `scope` { #early-exit-and-scope }

Normally the exit code of dependencies with `yield` is executed **after the response** is sent to the client.

      // actual response status.
      code == 100 -> true

      // Handle Processing (102) & Early Hints (103) and any new codes without failing
      // 100 and 101 are the exceptions with different meanings
      // But Early Hints not currently exposed
      code in (102 until 200) -> true

      else -> false
    }

 * API</h2>
 *
 * <p>The successor to Guava's caching API is <a
 * href="https://github.com/ben-manes/caffeine/wiki">Caffeine</a>. Its API is designed to make it a
 * nearly drop-in replacement. Note that it is not available for Android or GWT/J2CL and that it may
 * have <a href="https://github.com/ben-manes/caffeine/wiki/Guava">different (usually better)

Подробнее читайте в документации: [Зависимости с `yield` — раннее завершение и `scope`](../tutorial/dependencies/dependencies-with-yield.md#early-exit-and-scope).

### Зависимости с `yield` и `StreamingResponse`, технические детали { #dependencies-with-yield-and-streamingresponse-technical-details }

        final String sessionId = "session5";
        final List<String> emptyList = Collections.emptyList();

        // Should not throw exception when adding empty list
        // This validates the early return optimization
        try {
            urlFilterService.addIncludeUrlFilter(sessionId, emptyList);
        } catch (final Exception e) {
            fail("Should not throw exception for empty list: " + e.getMessage());

  }

  private fun logWithTime(message: String) {
    val startNs = startNs
    val timeMs =
      if (startNs == null) {
        // Event occurred before start, for an example an early cancel.
        0L
      } else {
        TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - startNs)
      }

    logger.invoke("[$timeMs ms] $message")
  }