assertThat(url.queryParameterValues("bar")).isEqualTo(listOf(null as String?))
    assertThat(url.queryParameterValues("baz")).isEqualTo(listOf(null as String?))
  }

  @Test
  fun queryParametersWithEmptyValues() {
    val url = parse("http://host/?foo=&bar=&baz=")
    assertThat(url.querySize).isEqualTo(3)
    assertThat(url.queryParameterNames).containsExactlyInAnyOrder("foo", "bar", "baz")

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

But if the client requests `http://example.com/items/bar` (a non-existent `item_id` `"bar"`), that client will receive an HTTP status code of 404 (the "not found" error), and a JSON response of:

```JSON
{
  "detail": "Item not found"
}
```

/// tip

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

Mas se o cliente faz uma requisição para `http://example.com/items/bar` (ou seja, um não existente `item_id "bar"`), esse cliente receberá um HTTP status code 404 (o erro "não encontrado" — *not found error*), e uma resposta JSON:

```JSON
{
  "detail": "Item not found"
}
```

/// tip | Dica

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

Pero si el cliente solicita `http://example.com/items/bar` (un `item_id` inexistente `"bar"`), ese cliente recibirá un código de estado HTTP de 404 (el error "no encontrado"), y un response JSON de:

```JSON
{
  "detail": "Item not found"
}
```

/// tip | Consejo

                callCount.incrementAndGet();
                startSignal.await();
                return result;
              }
            });

    List<Object> resultArray = doConcurrentGet(cache, "bar", count, startSignal);

    assertThat(callCount.get()).isEqualTo(1);
    for (int i = 0; i < count; i++) {
      assertWithMessage("result(%s) didn't match expected", i)
          .that(resultArray.get(i))

      implements TestListGenerator<Entry<String, Integer>> {

    @Override
    public SampleElements<Entry<String, Integer>> samples() {
      return new SampleElements<>(
          mapEntry("foo", 5),
          mapEntry("bar", 3),
          mapEntry("baz", 17),
          mapEntry("quux", 1),
          mapEntry("toaster", -2));
    }

    @SuppressWarnings("unchecked")
    @Override

  /** Tests that if specify '%' as safe the result is an idempotent escaper. */
  public void testCustomEscaper_withpercent() {
    UnicodeEscaper e = new PercentEscaper("%", false);
    assertEquals("foo%7Cbar", e.escape("foo|bar"));
    assertEquals("foo%7Cbar", e.escape("foo%7Cbar")); // idempotent
  }

  /** Test that giving a null 'safeChars' string causes a {@link NullPointerException}. */
  public void testBadArguments_null() {

    val headers =
      Headers
        .Builder()
        .add("WWW-Authenticate", "Digest,,,, Basic ,,foo=bar,realm=\"myrealm\"")
        .build()
    val expectedAuthParams = mutableMapOf<String?, String>()
    expectedAuthParams["realm"] = "myrealm"
    expectedAuthParams["foo"] = "bar"
    assertThat(headers.parseChallenges("WWW-Authenticate")).containsExactly(
      Challenge("Digest", mapOf()),

                callCount.incrementAndGet();
                startSignal.await();
                return result;
              }
            });

    List<Object> resultArray = doConcurrentGet(cache, "bar", count, startSignal);

    assertThat(callCount.get()).isEqualTo(1);
    for (int i = 0; i < count; i++) {
      assertWithMessage("result(%s) didn't match expected", i)
          .that(resultArray.get(i))

`PUT` is used to receive data that should replace the existing data.

### Warning about replacing { #warning-about-replacing }

That means that if you want to update the item `bar` using `PUT` with a body containing:

```Python
{
    "name": "Barz",
    "price": 3,
    "description": None,
}
```