public void testUniqueIndexNullValue() {
    List<@Nullable String> listWithNull = Lists.newArrayList((String) null);
    assertThrows(
        NullPointerException.class,
        () -> Maps.uniqueIndex((List<String>) listWithNull, Functions.constant(1)));
  }

  /** Null keys aren't allowed either. */
  public void testUniqueIndexNullKey() {
    List<String> oneStringList = Lists.newArrayList("foo");
    assertThrows(

Gt="scrollspy",Zt="bs.scrollspy",te=o.default.fn[Gt],ee="active",ne="position",ie=".nav, .list-group",oe={offset:10,method:"auto",target:""},ae={offset:"number",method:"string",target:"(string|element)"},se=function(){function t(t,e){var n=this;this._element=t,this._scrollElement="BODY"===t.tagName?window:t,this._config=this._getConfig(e),this._selector=this._config.target+" .nav-link,"+this._config.target+" .list-group-item,"+this._config.target+" .dropdown-item",this._offsets=[],this._targets=[],t...

        queryLambda.callback(cq);
        final Collection<FilterFunctionBuilder> list = new ArrayList<>();
        if (functionsLambda != null) {
            functionsLambda.callback((cqLambda, scoreFunctionBuilder) -> {
                ClickLogCQ cf = new ClickLogCQ();
                cqLambda.callback(cf);
                list.add(new FilterFunctionBuilder(cf.getQuery(), scoreFunctionBuilder));
            });
        }

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

/// tip

When raising an `HTTPException`, you can pass any value that can be converted to JSON as the parameter `detail`, not only `str`.

You could pass a `dict`, a `list`, etc.

They are handled automatically by **FastAPI** and converted to JSON.

///

## Add custom headers { #add-custom-headers }

The following commands set a local alias, validate the server information, create a bucket, copy data to that bucket, and list the contents of the bucket.

```sh
mc alias set local http://localhost:9000 minioadmin minioadmin
mc admin info
mc mb data
mc cp ~/Downloads/mydata data/
mc ls data/
```

            "*\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000\u0000";

    /**
     * This is a special name for querying the master browser that serves the
     * list of hosts found in "Network Neighborhood".
     */

    public static final String MASTER_BROWSER_NAME = "\u0001\u0002__MSBROWSE__\u0002";

    /**

        // Then
        assertEquals(0, request.getCapabilities() & Smb2Constants.SMB2_GLOBAL_CAP_ENCRYPTION);
    }

    @Test
    @DisplayName("Should generate correct dialect list")
    void testDialectGeneration() {
        // Given
        when(mockConfig.getMinimumVersion()).thenReturn(DialectVersion.SMB210);
        when(mockConfig.getMaximumVersion()).thenReturn(DialectVersion.SMB311);

     * addValue()} methods, is not significant.
     *
     * <p><b>Note:</b> in general, code should assume that the string form returned by {@code
     * ToStringHelper} for a given object may change. In particular, the list of types which are
     * checked for emptiness is subject to change. We currently check {@code CharSequence}s, {@code
     * Collection}s, {@code Map}s, optionals (including Guava's), and arrays.
     *
     * @since 33.4.0

     * Test <a href="https://issues.apache.org/jira/browse/MNG-5568">MNG-5568</a> edge case
     * which was showing transitive inconsistency: since A &gt; B and B &gt; C then we should have A &gt; C
     * otherwise sorting a list of ComparableVersions() will in some cases throw runtime exception;
     * see Netbeans issues <a href="https://netbeans.org/bugzilla/show_bug.cgi?id=240845">240845</a> and

/// note

如果你不知道差別，請查看 [Async: *"In a hurry?"*](../async.md#in-a-hurry){.internal-link target=_blank}.

///

### 第五步：回傳內容

{* ../../docs_src/first_steps/tutorial001.py h1[8] *}

你可以返回一個 `dict`、`list`、單個值作為 `str`、`int` 等。

你也可以返回 Pydantic 模型（稍後你會看到更多關於這方面的內容）。

有很多其他物件和模型會自動轉換為 JSON（包括 ORMs，等等）。試用你最喜歡的，很有可能它們已經有支援。

## 回顧

* 引入 `FastAPI`.
* 建立一個 `app` 實例。