この例では、クライアントが存在しないIDでアイテムを要求した場合、`404`のステータスコードを持つ例外を発生させます:

{* ../../docs_src/handling_errors/tutorial001.py hl[11] *}

### レスポンス結果

クライアントが`http://example.com/items/foo`（`item_id` `"foo"`）をリクエストすると、HTTPステータスコードが200で、以下のJSONレスポンスが返されます:

```JSON
{
  "item": "The Foo Wrestlers"
}
```

しかし、クライアントが`http://example.com/items/bar`（存在しない`item_id` `"bar"`）をリクエストした場合、HTTPステータスコード404（"not found"エラー）と以下のJSONレスポンスが返されます:

```JSON
{

    return current_user


@app.get("/users/me/items/")
async def read_own_items(current_user: User = Depends(get_current_active_user)):

    return current_user


@app.get("/users/me/items/")
async def read_own_items(current_user: User = Depends(get_current_active_user)):

                + "      <plugin>\n"
                + "         <m:configuration xmlns:m=\"http://maven.apache.org/POM/4.0.0\" xmlns=\"http://fabric8.io/fabric8-maven-plugin\">\n"
                + "             <myConfig>foo</myConfig>\n"
                + "         </m:configuration>\n"
                + "      </plugin>\n"
                + "    </plugins>\n"
                + "  </build>\n"
                + "</project>";

):
    return current_user


@app.get("/users/me/items/")
async def read_own_items(
    current_user: Annotated[User, Depends(get_current_active_user)],
):

		}
		if string(all) != want {
			t.Errorf("ReadAll returned %q, want %q", all, want)
		}
	}

	r := NewReader(strings.NewReader("foo foo"))
	buf := make([]byte, 3)
	r.Read(buf)
	if string(buf) != "foo" {
		t.Errorf("buf = %q; want foo", buf)
	}

	r.Reset(strings.NewReader("bar bar"))
	checkAll(r, "bar bar")

	*r = Reader{} // zero out the Reader

			fv:   defaultFormVals.Clone().Set(xhttp.AmzSignature, "my-signature"),
		},
		{
			name: "XIgnoreFoo does not have to appear in policy",
			fv:   defaultFormVals.Clone().Set("X-Ignore-Foo", "my-foo-value"),
		},
		{
			name: "File does not have to appear in policy",
			fv:   defaultFormVals.Clone().Set("File", "file-value"),
		},
		{
			name: "Signature does not have to appear in policy",

```JSON
{
    "name": "Foo",
    "description": "An optional description",
    "price": 45.2,
    "tax": 3.5
}
```

...como `description` e `tax` são opcionais (com um valor padrão de `None`), esse JSON "`object`" também é válido:

```JSON
{
    "name": "Foo",
    "price": 45.2
}
```

## Declare como um parâmetro { #declare-it-as-a-parameter }

	numVersions := 4
	obj := ObjectInfo{
		Name:        "foo",
		ModTime:     time.Now().Add(-31 * 24 * time.Hour),
		Size:        100 << 20,
		VersionID:   uuid.New().String(),
		IsLatest:    true,
		NumVersions: numVersions,
	}
	delMarker := ObjectInfo{
		Name:         "foo-deleted",
		ModTime:      time.Now().Add(-61 * 24 * time.Hour),
		Size:         0,

			prefix:      "foodir/foobject/foo.txt",
			want:        true,
		},
		{
			inputConfig: `<LifecycleConfiguration><Rule><Status>Enabled</Status><Filter></Filter><NoncurrentVersionTransition><StorageClass>S3TIER-1</StorageClass></NoncurrentVersionTransition></Rule></LifecycleConfiguration>`,
			prefix:      "foodir/foobject/foo.txt",
			want:        true,
		},
		{