/// tip | Подсказка

/// tip | Consejo

Pydantic, que es lo que impulsa toda la validación y serialización de datos en FastAPI, tiene un comportamiento especial cuando usas `Optional` o `Union[Something, None]` sin un valor por defecto, puedes leer más al respecto en la documentación de Pydantic sobre <a href="https://docs.pydantic.dev/2.3/usage/models/#required-optional-fields" class="external-link" target="_blank">Campos requeridos</a>.

	org := loadMetacacheSampleEntries(t)
	a, b := org.shallowClone(), org.shallowClone()
	be := b.entries()
	for i := range be {
		//  Modify b so it isn't deduplicated.
		be[i].metadata = []byte("something-else")
	}
	// Merge b into a
	a.merge(b, -1)
	//nolint:gocritic
	want := append(loadMetacacheSampleNames, loadMetacacheSampleNames...)
	sort.Strings(want)
	got := a.entries().names()
	if len(got) != len(want) {

http://%30%78%63%30%2e%30%32%35%30.01%2e  s:http p:/ h:0xc0.0250.01.
http://192.168.0.257

# Invalid escaping should trigger the regular host error handling.
http://%3g%78%63%30%2e%30%32%35%30%2E.01

# Something that isn't exactly an IP should get treated as a host and
# spaces escaped.
http://192.168.0.1\shello

# Fullwidth and escaped UTF-8 fullwidth should still be treated as IP.
# These are "0Xc0.0250.01" in fullwidth.

     * <pre>java -jar ${maven.repo.local}/org/apache/maven/maven-artifact/${maven.version}/maven-artifact-${maven.version}.jar "1.2.7" "1.2-SNAPSHOT"</pre>
     * command to command line. Result of given command will be something like this:
     * <pre>
     * Display parameters as parsed by Maven (in canonical form) and comparison result:
     * 1. 1.2.7 == 1.2.7
     *    1.2.7 &gt; 1.2-SNAPSHOT
     * 2. 1.2-SNAPSHOT == 1.2-snapshot

/// tip | Tipp

Pydantic, welches die gesamte Datenvalidierung und Serialisierung in FastAPI antreibt, hat ein spezielles Verhalten, wenn Sie `Optional` oder `Union[Something, None]` ohne Defaultwert verwenden, Sie können mehr darüber in der Pydantic-Dokumentation unter <a href="https://docs.pydantic.dev/2.3/usage/models/#required-fields" class="external-link" target="_blank">Required fields</a> erfahren.

 *     .build();
 * ```
 *
 * ## Force a Cache Response
 *
 * Sometimes you'll want to show resources if they are available immediately, but not otherwise.
 * This can be used so your application can show *something* while waiting for the latest data to be
 * downloaded. To restrict a request to locally-cached resources, add the `only-if-cached`
 * directive:
 *
 * ```java
 * Request request = new Request.Builder()

        if (submittingTaskQueue.thread == submitting) {
          sequencer = null;
          // Submit from inside a reentrant submit. We don't know if this one will be reentrant (and
          // can't know without submitting something to the executor) so queue to run iteratively.
          // Task must be null, since each execution on this executor can only produce one more
          // execution.
          checkState(submittingTaskQueue.nextTask == null);

ここで、`/unicorns/yolo`をリクエストすると、*path operation*は`UnicornException`を`raise`します。

しかし、これは`unicorn_exception_handler`で処理されます。

そのため、HTTPステータスコードが`418`で、JSONの内容が以下のような明確なエラーを受け取ることになります:

```JSON
{"message": "Oops! yolo did something. There goes a rainbow..."}
```

/// note | 技術詳細

また、`from starlette.requests import Request`と`from starlette.responses import JSONResponse`を使用することもできます。

     * This property is a comma separated list of entries with the syntax <code>GAV&gt;GAV</code>.
     * The first <code>GAV</code> can contain <code>*</code> for any elem (so <code>*:*:*</code> would mean ALL, something
     * you don't want). The second <code>GAV</code> is either fully specified, or also can contain <code>*</code>,
     * then it behaves as "ordinary relocation": the coordinate is preserved from relocated artifact.