import com.google.common.collect.UnmodifiableIterator;
import java.util.AbstractSet;
import java.util.Map;
import javax.annotation.CheckForNull;

/**
 * A class to represent the set of edges connecting an (implicit) origin node to a target node.
 *
 * <p>The {@link #nodeToOutEdge} map means this class only works on networks without parallel edges.
 * See {@link MultiEdgesConnecting} for a class that works with parallel edges.
 *

  }

  override fun pushPromise(
    streamId: Int,
    associatedStreamId: Int,
    headerBlock: List<Header>,
  ) {
    fail("")
  }

  override fun alternateService(
    streamId: Int,
    origin: String,
    protocol: ByteString,
    host: String,
    port: Int,
    maxAge: Long,
  ) {
    fail("")
  }

     * information that is available at the point the problem occurs and as such merely serves as best effort
     * to provide information to the user to track the problem back to its origin.
     *
     * @return The hint about the source of the problem or an empty string if unknown, never {@code null}.
     */
    String getSource();

    /**

 */
@ElementTypesAreNonnullByDefault
abstract class AbstractDirectedNetworkConnections<N, E> implements NetworkConnections<N, E> {
  /** Keys are edges incoming to the origin node, values are the source node. */
  final Map<E, N> inEdgeMap;

  /** Keys are edges outgoing from the origin node, values are the target node. */
  final Map<E, N> outEdgeMap;

  private int selfLoopCount;

import com.google.common.collect.UnmodifiableIterator;
import java.util.AbstractSet;
import java.util.Map;
import javax.annotation.CheckForNull;

/**
 * A class to represent the set of edges connecting an (implicit) origin node to a target node.
 *
 * <p>The {@link #nodeToOutEdge} map means this class only works on networks without parallel edges.
 * See {@link MultiEdgesConnecting} for a class that works with parallel edges.
 *

{
    "title": "Murder on the Orient Express",
    "authorInfo": {
        "name": "Agatha Christie",
        "yearRange": [1890, 1976],
        "penName": "Mary Westmacott"
    },
    "genre": "Crime novel",
    "publicationHistory": [
        {
            "year": 1934,
            "publisher": "Collins Crime Club (London)",
            "type": "Hardcover",
            "pages": 256
        },
        {
            "year": 1934,

///

```Python hl_lines="4  25"
{!> ../../docs_src/additional_status_codes/tutorial001.py!}
```

////

/// warning | "Achtung"

Wenn Sie eine `Response` direkt zurückgeben, wie im obigen Beispiel, wird sie direkt zurückgegeben.

Sie wird nicht mit einem Modell usw. serialisiert.

Stellen Sie sicher, dass sie die gewünschten Daten enthält und dass die Werte gültiges JSON sind (wenn Sie `JSONResponse` verwenden).

class="external-link" target="_blank">usando el prefijo 'X-'</a>.

Si tienes headers personalizados y deseas que un cliente pueda verlos en el navegador, es necesario que los añadas a tus configuraciones de CORS (puedes leer más en [CORS (Cross-Origin Resource Sharing)](../tutorial/cors.md){.internal-link target=_blank}), usando el parámetro `expose_headers` documentado en <a href="https://www.starlette.io/middleware/#corsmiddleware" class="external-link" target="_blank">Starlette's CORS docs</a>....

class="external-link" target="_blank">usando o prefixo 'X-'</a>.

Porém, se voce tiver cabeçalhos personalizados que deseja que um cliente no navegador possa ver, você precisa adicioná-los às suas configurações de CORS (saiba mais em [CORS (Cross-Origin Resource Sharing)](../tutorial/cors.md){.internal-link target=_blank}), usando o parâmetro `expose_headers` descrito na <a href="https://www.starlette.io/middleware/#corsmiddleware" class="external-link" target="_blank">documentação de CORS do Starlette</a>....

 * @param <E> Edge parameter type
 */
@ElementTypesAreNonnullByDefault
abstract class AbstractUndirectedNetworkConnections<N, E> implements NetworkConnections<N, E> {
  /** Keys are edges incident to the origin node, values are the node at the other end. */
  final Map<E, N> incidentEdgeMap;

  AbstractUndirectedNetworkConnections(Map<E, N> incidentEdgeMap) {
    this.incidentEdgeMap = checkNotNull(incidentEdgeMap);
  }