assertEquals(size + 1, multimap().size());
  }

  @MapFeature.Require(SUPPORTS_PUT)
  public void testPutTwoElements() {
    int size = getNumElements();

    List<V> values = copyToList(multimap().get(k0()));

    assertTrue(multimap().put(k0(), v1()));
    assertTrue(multimap().put(k0(), v2()));

    values.add(v1());
    values.add(v2());

    assertGet(k0(), values);

But there are specific cases where it's useful to get the `Request` object.

## Use the `Request` object directly { #use-the-request-object-directly }

Let's imagine you want to get the client's IP address/host inside of your *path operation function*.

For that you need to access the request directly.

# Without aliases


@app.get("/optional-list-str")
async def read_optional_list_str(
    p: Annotated[list[str] | None, Header()] = None,
):
    return {"p": p}


class HeaderModelOptionalListStr(BaseModel):
    p: list[str] | None = None


@app.get("/model-optional-list-str")
async def read_model_optional_list_str(

This also means that in many cases you can pass the same object you get from a request **directly to the database**, as everything is validated automatically.

The same applies the other way around, in many cases you can just pass the object you get from the database **directly to the client**.

With **FastAPI** you get all of **Pydantic**'s features (as FastAPI is based on Pydantic for all the data handling):

   * create, cache and return" pattern. For further improvements, use {@link LoadingCache} and its
   * {@link LoadingCache#get(Object) get(K)} method instead of this one.
   *
   * <p>Among the improvements that this method and {@code LoadingCache.get(K)} both provide are:
   *
   * <ul>
   *   <li>{@linkplain LoadingCache#get(Object) awaiting the result of a pending load} rather than
   *       starting a redundant one

        String response = given().contentType("application/json").when().get("/api/v1/labels").asString();

        JsonPath jsonPath = JsonPath.from(response);
        assertTrue(jsonPath.getInt("record_count") >= 0);

        List<Map<String, Object>> labels = jsonPath.getList("data");
        if (labels != null && !labels.isEmpty()) {
            Map<String, Object> firstLabel = labels.get(0);

        assertTrue(crawlingConfigHelper.getPipeline("D1").isEmpty());
        assertEquals("wp", crawlingConfigHelper.getPipeline("W1P").get());
        assertEquals("fp", crawlingConfigHelper.getPipeline("F1P").get());
        assertEquals("dp", crawlingConfigHelper.getPipeline("D1P").get());
    }

    @Test
    public void test_sessionCountId() {
        final String sessionId = "12345";

# Usage: setup.packages.sh <package_list.txt>
set -e

# Prevent apt install tzinfo from asking our location (assumes UTC)
export DEBIAN_FRONTEND=noninteractive

apt-get update
# Remove commented lines and blank lines
apt-get install -y --no-install-recommends $(sed -e '/^\s*#.*$/d' -e '/^\s*$/d' "$1" | sort -u)

        val buildTime = when {
            buildTimestampFromProperty != null -> {
                timestampFormat.parse(buildTimestampFromProperty)
            }
            runningInstallTask.get() || runningDocsTestTask.get() || runningOnCi.get() -> {
                Date()
            }
            else -> {
                Date().withoutTime()
            }
        }
        return timestampFormat.format(buildTime)
    }

{* ../../docs_src/first_steps/tutorial001_py310.py hl[6] *}

El `@app.get("/")` le dice a **FastAPI** que la función justo debajo se encarga de manejar requests que vayan a:

* el path `/`
* usando una <dfn title="un método HTTP GET"><code>get</code> operación</dfn>

/// info | Información sobre `@decorator`

Esa sintaxis `@algo` en Python se llama un "decorador".