✅ **Exec** form:

```Dockerfile
# ✅ Do this
CMD ["fastapi", "run", "app/main.py", "--port", "80"]
```

⛔️ **Shell** form:

```Dockerfile
# ⛔️ Don't do this
CMD fastapi run app/main.py --port 80
```

Make sure to always use the **exec** form to ensure that FastAPI can shutdown gracefully and [lifespan events](../advanced/events.md) are triggered.

### 問題を理解する { #understand-the-problem }

* まず、そのプルリクエストが解決しようとしている**問題を理解**してください。長めの議論が GitHub Discussion や issue にあるかもしれません。

* その問題は実は**別の方法**で解決でき、プルリクエスト自体が不要な場合もあります。その場合は、その提案や質問をしても良いでしょう。

### スタイルは気にしすぎない { #dont-worry-about-style }

* コミットメッセージのスタイルなどはあまり気にしなくて大丈夫です。私は squash and merge を使い、コミットを手動で調整します。

* スタイルルールについても心配無用です。自動化ツールがすでにチェックしています。

ほかにスタイルや一貫性の要件があれば、私から直接依頼しますし、必要な変更を上に積む形でコミットを追加します。

	// By default, empty data usage cache
	*d = dataUsageCache{}

	load := func(name string, timeout time.Duration) (bool, error) {
		// Abandon if more than time.Minute, so we don't hold up scanner.
		// drive timeout by default is 2 minutes, we do not need to wait longer.
		ctx, cancel := context.WithTimeout(ctx, timeout)
		defer cancel()

# ----------------------------------------------------------
# Application Exception
# ---------------------
# /- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# five framework-embedded messages (don't change key names)
# - - - - - - - - - -/
errors.login.failure = Login failed.
errors.app.illegal.transition = Illegal transition. Please try again.

# ----------------------------------------------------------
# Application Exception
# ---------------------
# /- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# five framework-embedded messages (don't change key names)
# - - - - - - - - - -/
errors.login.failure = Login failed.
errors.app.illegal.transition = Illegal transition. Please try again.

    return object : DerAdapter<Any?> {
      override fun matches(header: DerHeader): Boolean = true

      override fun toDer(
        writer: DerWriter,
        value: Any?,
      ) {
        // If we don't understand this hint, encode the body as a byte string. The byte string
        // will include a tag and length header as a prefix.
        val adapter = chooser(writer.typeHint) as DerAdapter<Any?>?
        when {

        @SuppressWarnings("nullness") // safe because we pass sort() a range that contains real Ts
        T[] castBuffer = (T[]) buffer;
        // We've already taken O(k log k), let's make sure we don't take longer than O(k log k).
        sort(castBuffer, left, right + 1, comparator);
        break;
      }
    }
    bufferSize = k;

    threshold = uncheckedCastNullableTToT(buffer[minThresholdPosition]);

        this.cacheExpireAfterWrite = cacheExpireAfterWrite;
    }

    /**
     * Key object for statistics tracking that contains an identifier and optional URL.
     * Used when tracking statistics for objects that don't have built-in URL extraction.
     */
    public static class StatsKeyObject {

        /** Unique identifier for this statistics key object. */
        private final String id;

 *   <li>It doesn't support backpressure and other features needed for resilience.
 *   <li>It doesn't provide much control of threading.
 *   <li>It doesn't offer much monitoring.
 *   <li>It doesn't propagate exceptions, so apps don't have a way to react to them.
 *   <li>It doesn't interoperate well with RxJava, coroutines, and other more commonly used
 *       alternatives.

        .isEqualTo(new FreshValueGenerator().generateFresh(String.class));
  }

  public void testFreshCurrency() {
    FreshValueGenerator generator = new FreshValueGenerator();
    // repeat a few times to make sure we don't stumble upon a bad Locale
    assertThat(generator.generateFresh(Currency.class)).isNotNull();
    assertThat(generator.generateFresh(Currency.class)).isNotNull();