{!../../docs_src/first_steps/tutorial001.py!}
```

O `@app.get("/")` diz ao **FastAPI** que a função logo abaixo é responsável por tratar as requisições que vão para:

* a rota `/`
* usando o  <abbr title="o método HTTP GET">operador <code>get</code></abbr>

/// info | "`@decorador`"

Essa sintaxe `@alguma_coisa` em Python é chamada de "decorador".

Você o coloca em cima de uma função. Como um chapéu decorativo (acho que é daí que vem o termo).

package cmd

import (
	"bytes"
	"context"
	"encoding/gob"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"math/rand"
	"strconv"
	"strings"
	"sync"
	"time"

	jsoniter "github.com/json-iterator/go"
	"github.com/minio/minio/internal/bucket/lifecycle"
	"github.com/minio/minio/internal/bucket/object/lock"
	"github.com/minio/minio/internal/bucket/versioning"
	"github.com/minio/minio/internal/color"

	startOffset, length, err := rs.GetOffsetLength(actualPartSize)
	if err != nil {
		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	// maximum copy size for multipart objects in a single operation
	if isMaxObjectSize(length) {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrEntityTooLarge), r.URL)
		return
	}

	if isRemoteCopyRequired(ctx, srcBucket, dstBucket, objectAPI) {

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"encoding/json"
	"io"
	"net/http"
	"strconv"

	jsoniter "github.com/json-iterator/go"
	"github.com/minio/madmin-go/v3"
	"github.com/minio/minio/internal/config/storageclass"
	"github.com/minio/mux"
	"github.com/minio/pkg/v3/policy"
)

var (
	// error returned when remote tier already exists

  }

  public void testImmutableSortedSetCopyOfIterator() {
    Set<Object> original = ImmutableSet.of(new Object(), new Object());

    assertThrows(ClassCastException.class, () -> ImmutableSortedSet.copyOf(original.iterator()));
  }

  private void doHasAllFauxveridesTest(Class<?> descendant, Class<?> ancestor) {
    Set<MethodSignature> required = getAllRequiredToFauxveride(ancestor);

  }

  /**
   * Guaranteed to throw an exception and leave the map unmodified.
   *
   * @throws UnsupportedOperationException always
   * @deprecated Unsupported operation.
   */
  @CanIgnoreReturnValue
  @Deprecated
  @Override
  @DoNotCall("Always throws UnsupportedOperationException")
  @CheckForNull
  public <T extends B> T putInstance(Class<T> type, T value) {

  }

  public void testImmutableSortedSetCopyOfIterator() {
    Set<Object> original = ImmutableSet.of(new Object(), new Object());

    assertThrows(ClassCastException.class, () -> ImmutableSortedSet.copyOf(original.iterator()));
  }

  private void doHasAllFauxveridesTest(Class<?> descendant, Class<?> ancestor) {
    Set<MethodSignature> required = getAllRequiredToFauxveride(ancestor);

$element.trigger($.Event(EVENT_EXPANDED))\n    }\n  }\n\n  // Static\n\n  static _jQueryInterface(operation) {\n    return this.each(function () {\n      let data = $(this).data(DATA_KEY)\n\n      if (!data) {\n        data = new ExpandableTable($(this))\n        $(this).data(DATA_KEY, data)\n      }\n\n      if (typeof operation === 'string' && /init|toggleRow/.test(operation)) {\n        data[operation]()\n      }\n    })\n  }\n}\n\n/**\n  * Data API\n  * ====================================================\n...

   * which is still better than alternatives.
   *
   * Per-thread hash codes are initialized to random values.
   * Contention and/or table collisions are indicated by failed
   * CASes when performing an update operation (see method
   * retryUpdate). Upon a collision, if the table size is less than
   * the capacity, it is doubled in size unless some other thread
   * holds the lock. If a hashed slot is empty, and lock is

* データ処理:
    * たとえば、時間のかかる処理を必要とするファイル受信時には、「受信済み」(HTTP 202) のレスポンスを返し、バックグラウンドで処理できます。

## `BackgroundTasks` の使用

まず初めに、`BackgroundTasks` をインポートし、` BackgroundTasks` の型宣言と共に、*path operation 関数* のパラメーターを定義します:

```Python hl_lines="1  13"
{!../../docs_src/background_tasks/tutorial001.py!}
```

**FastAPI** は、`BackgroundTasks` 型のオブジェクトを作成し、そのパラメーターに渡します。

## タスク関数の作成