但如果你在瀏覽器前往 [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo)，你會看到漂亮的 HTTP 錯誤：

```JSON
{
  "detail": [
    {
      "type": "int_parsing",
      "loc": [
        "path",
        "item_id"
      ],
      "msg": "Input should be a valid integer, unable to parse string as an integer",
      "input": "foo"
    }
  ]
}
```

因為路徑參數 `item_id` 的值是 `"foo"`，它不是 `int`。

    }

    @Test
    @DisplayName("writeSetupWireFormat writes subCommand and padding")
    void testWriteSetup() throws Exception {
        Trans2GetDfsReferral cmd = new Trans2GetDfsReferral("foo");
        byte[] buf = new byte[2];
        int r = cmd.writeSetupWireFormat(buf, 0);
        assertEquals(2, r);
        byte subCmd = (byte) getPrivateField(cmd, "subCommand");
        assertEquals(subCmd, buf[0]);

text=foo...

  private @interface ExampleAnnotation {}

  private enum AnEnum {
    @ExampleAnnotation
    FOO,
    BAR
  }

  @J2ktIncompatible
  public void testGetField() {
    Field foo = Enums.getField(AnEnum.FOO);
    assertThat(foo.getName()).isEqualTo("FOO");
    assertTrue(foo.isAnnotationPresent(ExampleAnnotation.class));

    Field bar = Enums.getField(AnEnum.BAR);

{* ../../docs_src/path_params/tutorial001_py310.py hl[6:7] *}

パスパラメータ `item_id` の値は、引数 `item_id` として関数に渡されます。

したがって、この例を実行して [http://127.0.0.1:8000/items/foo](http://127.0.0.1:8000/items/foo) にアクセスすると、次のレスポンスが表示されます。

```JSON
{"item_id":"foo"}
```

## 型付きパスパラメータ { #path-parameters-with-types }

標準のPythonの型アノテーションを使用して、関数内のパスパラメータの型を宣言できます:

{* ../../docs_src/path_params/tutorial002_py310.py hl[7] *}

    assertThat(mapCache.get("key")).isEqualTo("new value");
  }

  @Test
  public void testRemoveEqualKeyWithDifferentReference() {
    String fooReference1 = new String("foo");
    String fooReference2 = new String("foo");
    assertThat(fooReference1).isNotSameInstanceAs(fooReference2);

    assertThat(mapCache.put(fooReference1, "bar")).isNull();

KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

<project>
  <modelVersion>4.0.0</modelVersion>
  <artifactId>foo</artifactId>
  <groupId>foo</groupId>
  <version>99.44</version>
  <packaging>bleh</packaging>

  <build>
    <pluginManagement>
      <plugins>
        <plugin>

      ImmutableSet.of(
          // keep-sorted start
          "dominio.com.co",
          "foo.bar.ca",
          "foo.bar.co.il",
          "foo.bar.com",
          "foo.blogspot.co.uk",
          "foo.blogspot.com",
          "foo.ca",
          "foo.eDu.au",
          "foo.uk.com",
          "home.netscape.com",
          "pvt.k12.ca.us",
          "state.CA.us",

在这种情况下，**FastAPI** 将期望像这样的请求体：

```JSON hl_lines="2"
{
    "item": {
        "name": "Foo",
        "description": "The pretender",
        "price": 42.0,
        "tax": 3.2
    }
}
```

而不是：

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2
}
```

## 总结 { #recap }

    assertThat(Strings.lenientFormat("%s")).isEqualTo("%s");
    assertThat(Strings.lenientFormat("%s", 5)).isEqualTo("5");
    assertThat(Strings.lenientFormat("foo", 5)).isEqualTo("foo [5]");
    assertThat(Strings.lenientFormat("foo", 5, 6, 7)).isEqualTo("foo [5, 6, 7]");
    assertThat(Strings.lenientFormat("%s %s %s", "%s", 1, 2)).isEqualTo("%s 1 2");
    assertThat(Strings.lenientFormat("", 5, 6)).isEqualTo(" [5, 6]");