在這個範例中，當用戶端以不存在的 ID 請求項目時，raise 一個狀態碼為 `404` 的例外：

{* ../../docs_src/handling_errors/tutorial001_py310.py hl[11] *}

### 回應結果 { #the-resulting-response }

如果用戶端請求 `http://example.com/items/foo`（`item_id` 為 `"foo"`），會收到 200 的 HTTP 狀態碼，以及以下 JSON 回應：

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

但如果用戶端請求 `http://example.com/items/bar`（不存在的 `item_id` `"bar"`），會收到 404（"not found"）的 HTTP 狀態碼，以及以下 JSON 回應：

```JSON
{

          {
            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");
          }
        };

    return this;
  }

  /**
   * Sets distinct values for {@code type}, so that when a class {@code Foo} is tested for {@link
   * Object#equals} and {@link Object#hashCode}, and its construction requires a parameter of {@code
   * type}, the distinct values of {@code type} can be passed as parameters to create {@code Foo}
   * instances that are unequal.
   *

                </div>
            </la:form>
        </section>
    </main>
    <jsp:include page="/WEB-INF/view/common/admin/footer.jsp"></jsp:include>
</div>
<jsp:include page="/WEB-INF/view/common/admin/foot.jsp"></jsp:include>
</body>

                </div>
            </div>
        </section>
    </main>
    <jsp:include page="/WEB-INF/view/common/admin/footer.jsp"></jsp:include>
</div>
<jsp:include page="/WEB-INF/view/common/admin/foot.jsp"></jsp:include>
</body>

			IsTruncated: false,
			Objects: []ObjectInfo{
				{Name: "foo/201910/1112"},
				{Name: "foo/201910/1122"},
			},
		},
		// ListObjectsResult-38 list with prefix match 1 level deep
		38: {
			IsTruncated: false,
			Objects: []ObjectInfo{
				{Name: "foo/201910/1112"},
				{Name: "foo/201910/1122"},
				{Name: "foo/201910/2112"},
				{Name: "foo/201910_txt"},
			},
		},

  public void testSyntaxException() {
    assertThrows(PatternSyntaxException.class, () -> new PatternFilenameFilter("("));
  }

  public void testAccept() {
    File dir = new File("foo");
    FilenameFilter filter = new PatternFilenameFilter("a+");
    assertTrue(filter.accept(dir, "a"));
    assertTrue(filter.accept(dir, "aaaa"));
    assertFalse(filter.accept(dir, "b"));

    // Show that dir is ignored

  public void testPatternSplitLookBehind() {
    if (!CommonPattern.isPcreLike()) {
      return;
    }
    String toSplit = ":foo::barbaz:";
    String regexPattern = "(?<=:)";
    Iterable<String> split = Splitter.onPattern(regexPattern).split(toSplit);
    assertThat(split).containsExactly(":", "foo:", ":", "barbaz:").inOrder();
    // splits into chunks ending in :
  }

public class DomUtilTest extends TestCase {

    /**
     * @throws Exception
     */
    public void testGetContentsAsStream() throws Exception {
        final String contents = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><foo/>";
        assertNotNull("1", DomUtil.getContentsAsStream(contents, "UTF-8"));
    }

    /**
     * @throws Exception
     */
    public void testToString() throws Exception {

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

...`description` ve `tax` opsiyonel olduğu için (default değerleri `None`), şu JSON "`object`" da geçerli olur:

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

## Parametre olarak tanımlayın { #declare-it-as-a-parameter }