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

### Die resultierende Response

Wenn der Client `http://example.com/items/foo` anfragt (ein `item_id` `"foo"`), erhält dieser Client einen HTTP-Statuscode 200 und folgende JSON-Response:

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

 */
public class ClassLoaderIteratorTest {

    /**
     * @throws Exception
     */
    @Test
    public void test() throws Exception {
        final ClassLoader cl1 = new URLClassLoader(new URL[] { new URL("file:/foo") }, null);
        final ClassLoader cl2 = new URLClassLoader(new URL[] { new URL("file:/bar") }, cl1);
        final ClassLoader cl3 = new URLClassLoader(new URL[] { new URL("file:/baz") }, cl2);

        .Builder()
        .code(HttpURLConnection.HTTP_MOVED_PERM)
        .addHeader("Location: /foo")
        .build(),
    )
    server.enqueue(
      MockResponse
        .Builder()
        .body("DEF")
        .build(),
    )
    val request1 = Request.Builder().url(server.url("/foo")).build()
    val response1 = client.newCall(request1).execute()

そしてURLは以下です:

```
http://localhost:8000/items/?q=foo&q=bar
```

複数の*クエリパラメータ*の値`q`（`foo`と`bar`）を*path operation関数*内で*関数パラメータ*`q`としてPythonの`list`を受け取ることになります。

そのため、このURLのレスポンスは以下のようになります:

```JSON
{
  "q": [
    "foo",
    "bar"
  ]
}
```

/// tip | 豆知識

          {
            set("foo");
          }
        };
    assertFalse(future.cancel(true));
    assertFalse(future.isCancelled());
    assertTrue(future.isDone());
  }

  public void testGetWithTimeoutDoneFuture() throws Exception {
    AbstractFuture<String> future =
        new AbstractFuture<String>() {
          {
            set("foo");
          }
        };

🖼, 👉 🏷 🔛 📣 🎻 "`object`" (⚖️ 🐍 `dict`) 💖:

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

... `description` & `tax` 📦 (⏮️ 🔢 💲 `None`), 👉 🎻 "`object`" 🔜 ☑:

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

## 📣 ⚫️ 🔢

🚮 ⚫️ 👆 *➡ 🛠️*, 📣 ⚫️ 🎏 🌌 👆 📣 ➡ & 🔢 🔢:

 *
 * <p>For example, an XML escaper would convert the literal string {@code "Foo<Bar>"} into {@code
 * "Foo&lt;Bar&gt;"} to prevent {@code "<Bar>"} from being confused with an XML tag. When the
 * resulting XML document is parsed, the parser API will return this text as the original literal
 * string {@code "Foo<Bar>"}.
 *
 * <p>A {@code CharEscaper} instance is required to be stateless, and safe when used concurrently by

        }

    }

    /**
     * @param <T>
     */
    public static class Foo<T> {

        /** */
        public List<T> list;

    }

    /** */
    public static class Bar extends Foo<String> {
    }

    assertUnescaped(e, '@');

    // Don't use plus for spaces
    assertEscaping(e, "%20", ' ');

    assertEquals("safe%20with%20spaces", e.escape("safe with spaces"));
    assertEquals("foo@bar.com", e.escape("foo@bar.com"));
  }

  private UrlEscaperTesting() {}

{* ../../docs_src/header_params/tutorial003_an_py310.py hl[9] *}

Si te comunicas con esa *path operation* enviando dos headers HTTP como:

```
X-Token: foo
X-Token: bar
```

El response sería como:

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## Recapitulación

Declara headers con `Header`, usando el mismo patrón común que `Query`, `Path` y `Cookie`.