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`.

    return Multimaps.forMap(map).asMap();
  }

  @Override
  protected Map<String, Collection<Integer>> makePopulatedMap() {
    Map<String, Integer> map = new HashMap<>();
    map.put("foo", 1);
    map.put("bar", 2);
    map.put("cow", 3);
    return Multimaps.forMap(map).asMap();
  }

  @Override
  public void testEntrySetRemoveAllNullFromEmpty() {
    try {

    assertEquals("", Files.getFileExtension("blah."));
    assertEquals("", Files.getFileExtension(".blah."));
    assertEquals("", Files.getFileExtension("/foo.bar/blah"));
    assertEquals("", Files.getFileExtension("/foo/.bar/blah"));
  }

  public void testGetNameWithoutExtension() {
    assertEquals("", Files.getNameWithoutExtension(".txt"));

Тоді, у випадку запиту за URL:

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

Ви отримаєте кілька значень *query параметра* `q` (`foo` і `bar`) у вигляді списку `list` в Python у Вашій *функції обробки шляху*, у *параметрі функції* `q`.

Отже, відповідь на цей URL буде:

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

/// tip | Підказка

{* ../../docs_src/response_model/tutorial004.py hl[24] *}

이러한 기본값은 응답에 포함되지 않고 실제로 설정된 값만 포함됩니다.

따라서 해당 *경로 작동*에 ID가 `foo`인 항목(items)을 요청으로 보내면 (기본값을 제외한) 응답은 다음과 같습니다:

```JSON
{
    "name": "Foo",
    "price": 50.2
}
```

/// info | 정보

    builder.put("foo", 2);
    assertMapEquals(builder.buildOrThrow(), "foo", 2);
  }

  public void testBuilderPutImmutableEntryWithNullKeyFailsAtomically() {
    Builder<String, Integer> builder = new Builder<>();
    assertThrows(NullPointerException.class, () -> builder.put(immutableEntry((String) null, 1)));
    builder.put("foo", 2);
    assertMapEquals(builder.buildOrThrow(), "foo", 2);

    }

    /**
     * @throws Exception
     */
    @Test
    public void testIsAncestor() 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);

  }

  @Test
  fun outOfOrderResponses() {
    val firstResponseCode = AtomicInteger()
    val secondResponseCode = AtomicInteger()
    val secondRequest = "/bar"
    val firstRequest = "/foo"
    val latch = CountDownLatch(1)
    val dispatcher: Dispatcher =
      object : Dispatcher() {
        override fun dispatch(request: RecordedRequest): MockResponse {
          if (request.url.encodedPath == firstRequest) {

### The resulting response { #the-resulting-response }

If the client requests `http://example.com/items/foo` (an `item_id` `"foo"`), that client will receive an HTTP status code of 200, and a JSON response of:

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