Vemos que vamos a necesitar algunas dependencias usadas en varios lugares de la aplicación.

Así que las ponemos en su propio módulo `dependencies` (`app/dependencies.py`).

Ahora utilizaremos una dependencia simple para leer un encabezado `X-Token` personalizado:

//// tab | Python 3.9+

```Python hl_lines="3  6-8" title="app/dependencies.py"
{!> ../../docs_src/bigger_applications/app_an_py39/dependencies.py!}
```

    return (graph instanceof ImmutableValueGraph)
        ? (ImmutableValueGraph<N, V>) graph
        : new ImmutableValueGraph<N, V>(graph);
  }

  /**
   * Simply returns its argument.
   *
   * @deprecated no need to use this
   */
  @InlineMe(
      replacement = "checkNotNull(graph)",
      staticImports = "com.google.common.base.Preconditions.checkNotNull")
  @Deprecated

         * the 'received' member of the response object will not
         * be set to true indicating the send and sendTransaction
         * methods that the next part should be sent. This is a
         * very indirect and simple batching control mechanism.
         */

        if (andx == null || !USE_BATCHING || batchLevel >= getBatchLimit(andx.command)) {
            andxCommand = (byte) 0xFF;
            andx = null;

/// danger

Never store user's plaintext passwords. Always store a "secure hash" that you can then verify.

If you don't know, you will learn what a "password hash" is in the [security chapters](security/simple-oauth2.md#password-hashing){.internal-link target=_blank}.

///

## Multiple models { #multiple-models }

         * (thanks to the checkArgument calls in getAnnotatedMethodsNotCached). If it happens, we'd
         * prefer to propagate an IllegalArgumentException to the caller. However, we don't want to
         * simply rethrow an exception (e.getCause()) that may in rare cases have come from another
         * thread. To accomplish both goals, we wrap that IllegalArgumentException in a new
         * instance.
         */

    Address getByName(String hostname, boolean possibleNTDomainOrWorkgroup) throws UnknownHostException;

    /**
     * Determines the address of a host given it's host name. The name can be a
     * machine name like "jcifs.samba.org", or an IP address like "192.168.1.15".
     *
     * @param hostname
     *            NetBIOS or DNS hostname to resolve
     * @return the found address
     * @throws java.net.UnknownHostException

And the `dict` you receive as `weights` will actually have `int` keys and `float` values.

///

## Recap { #recap }

With **FastAPI** you have the maximum flexibility provided by Pydantic models, while keeping your code simple, short and elegant.

But with all the benefits:

* Editor support (completion everywhere!)
* Data conversion (a.k.a. parsing / serialization)
* Data validation
* Schema documentation

        }
    }

    @Test
    public void searchTestWithBoost() throws Exception {
        String field = "content";
        String query1 = "java";
        String query2 = "sample";
        Map<String, String> params = new HashMap<>();
        params.put("q", field + ":" + query1 + "^1000 OR " + field + ":" + query2);
        params.put("num", "100");

Vedrai la documentazione interattiva dell'API (offerta da <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank">Swagger UI</a>):

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Documentazione interattiva alternativa

Adesso accedi all'url <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.

![Swagger UI](https://fastapi.tiangolo.com/img/index/index-01-swagger-ui-simple.png)

### Alternative API-Dokumentation

Gehen Sie jetzt auf <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>.