O **FastAPI** se encarrega de resolver essas dependências.

## Primeira dependência "dependable" { #first-dependency-dependable }

Você pode criar uma primeira dependência ("dependable") dessa forma:

{* ../../docs_src/dependencies/tutorial005_an_py310.py hl[8:9] *}

Esse código declara um parâmetro de consulta opcional, `q`, com o tipo `str`, e então retorna esse parâmetro.

Vous pouvez diffuser des données vers le client en utilisant les **Server-Sent Events** (SSE).

C'est similaire à [Diffuser des JSON Lines](stream-json-lines.md), mais cela utilise le format `text/event-stream`, pris en charge nativement par les navigateurs via l’API [`EventSource`](https://developer.mozilla.org/en-US/docs/Web/API/EventSource).

/// info | Info

Ajouté dans FastAPI 0.135.0.

///

/// tip | Consejo

Normalmente tendrás mucho mejor rendimiento usando un [Response Model](../tutorial/response-model.md) que devolviendo un `JSONResponse` directamente, ya que de esa forma serializa los datos usando Pydantic, en Rust.

///

## Devolver una `Response` { #return-a-response }

De hecho, puedes devolver cualquier `Response` o cualquier subclase de ella.

/// info | Información

// and returns the path to the package source relative to $GOROOT (or $GOPATH).
func pkgPath() (importPath string, isStd bool, modPath, modDir string, err error) {
	errorf := func(format string, args ...any) (string, bool, string, string, error) {
		return "", false, "", "", fmt.Errorf(format, args...)
	}
	goTool, err := goTool()
	if err != nil {
		return errorf("%w", err)
	}

///

/// info | Información

Para declarar headers, necesitas usar `Header`, porque de otra forma los parámetros serían interpretados como parámetros de query.

///

## Conversión automática { #automatic-conversion }

```

Es könnte sogar ein unendlicher Stream sein, bei dem Sie kontinuierlich Daten senden.

## JSON Lines { #json-lines }

In diesen Fällen ist es üblich, „JSON Lines“ zu senden, das ist ein Format, bei dem Sie pro Zeile genau ein JSON-Objekt senden.

Eine Response hätte einen Content-Type von `application/jsonl` (anstelle von `application/json`) und der Body sähe etwa so aus:

```json

        assertNotNull(details);
        assertTrue(details.contains("Total: 1 event(s)"));
        assertTrue(details.contains("Something went wrong"));
        // Throwable is no longer included in summary-oriented format
        // Only log message is shown per event line
    }

    @Test
    public void test_formatDetails_emptyList() {
        TestableLogNotificationJob testableJob = new TestableLogNotificationJob();

        return out;
    }

    private static List<String> parentCommitsOf(String commit) throws IOException, InterruptedException, ExecutionException {
        String stdout = getStdout(new String[] {"git", "show", "--format=%P", "--no-patch", "--no-show-signature", commit});
        String trimmed = stdout.trim();
        if (trimmed.isEmpty()) {
            return Collections.emptyList();
        }

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import org.jspecify.annotations.Nullable;

/**
 * An object that converts literal text into a format safe for inclusion in a particular context
 * (such as an XML document). Typically (but not always), the inverse process of "unescaping" the
 * text is performed automatically by the relevant parser.
 *

        PacDataInputStream pdis = createInputStream(data);
        SID sid = pdis.readId();
        // The readId method creates a SID with authority 5 and the RID value
        // Expected format: S-1-5-305419896
        String sidString = sid.toString();
        assertNotNull(sidString);
        assertEquals("S-1-5-305419896", sidString);
    }

    @Test