# Release 2.12.1

### Bug Fixes and Other Changes

          TimeoutsToUse.FINITE,
          isBoolean(method) ? Outcome.FAILURE : Outcome.HANG);
      addTests(
          suite,
          method,
          Scenario.SATISFIED_AND_OCCUPIED_BEFORE_ENTERING,
          TimeoutsToUse.INFINITE,
          isGuarded(method) ? Outcome.HANG : (isTryEnter(method) ? Outcome.FAILURE : Outcome.HANG));
      addTests(
          suite,
          method,

     * this is no worse than what FutureTask does in that situation. Additionally, because the
     * Future was cancelled, its listeners have been run, so its consumers will not hang.
     *
     * Contrast this to the situation we have if setResult() throws, a situation described below.
     */
    I sourceResult;
    try {
      sourceResult = getDone(localInputFuture);

     * this is no worse than what FutureTask does in that situation. Additionally, because the
     * Future was cancelled, its listeners have been run, so its consumers will not hang.
     *
     * Contrast this to the situation we have if setResult() throws, a situation described below.
     */
    I sourceResult;
    try {
      sourceResult = getDone(localInputFuture);

trường hợp, cách các biến môi trường trở nên hữu ích và có thể áp dụng không thực sự rõ ràng ngay từ đầu, nhưng chúng sẽ liên tục xuất hiện trong rất nhiều tình huống khi bạn phát triển ứng dụng, vì vậy việc hiểu biết về chúng là hữu ích.

Chẳng hạn, bạn sẽ cần những thông tin này khi bạn học về [Môi trường ảo](virtual-environments.md)....

 *  Fix: Don't leak file handles when a cache disk write fails.

 *  Fix: Don't hang when the public suffix database cannot be loaded. We had a bug where a failure
    reading the public suffix database would cause subsequent reads to hang when they should have
    crashed.

 *  Fix: Avoid `InetAddress.getCanonicalHostName()` in MockWebServer. This avoids problems if the

        .connect()
      fail<Any>()
    } catch (expected: ConnectException) {
    }
  }

  @Test
  fun shutdownWhileBlockedDispatching() {
    // Enqueue a request that'll cause MockWebServer to hang on QueueDispatcher.dispatch().
    val connection = server.url("/").toUrl().openConnection() as HttpURLConnection
    connection.setReadTimeout(500)
    try {
      connection.getResponseCode()
      fail<Any>()

//   - on xl.meta (array of versions) on disk to check for version disparity
//   - on rewrite dataDir on disk that must be additionally purged
//     only after as a 2-phase call, allowing the older dataDir to
//     hang-around in-case we need some form of recovery.
type RenameDataResp struct {
	Sign       []byte `msg:"s"`

    }
    assertThat(other.toString()).isEqualTo("MockWebServer{closed}")
  }

  @Test
  fun closeWhileBlockedDispatching() {
    // Enqueue a request that'll cause MockWebServer to hang on QueueDispatcher.dispatch().
    val connection = server.url("/").toUrl().openConnection() as HttpURLConnection
    connection.readTimeout = 500
    assertFailsWith<SocketTimeoutException> {
      connection.responseCode

## Join the chat { #join-the-chat }

Join the 👥 <a href="https://discord.gg/VQjSZaeJmf" class="external-link" target="_blank">Discord chat server</a> 👥 and hang out with others in the FastAPI community.

/// tip