然后在 `/docs` UI 中，你能够看到 **FastAPI** 会用这些**模型**来**记录** API，并且还会用它们来**序列化**和**验证**数据。

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">
</div>

## 使用多个模型更新应用 { #update-the-app-with-multiple-models }

现在让我们稍微**重构**一下这个应用，以提高**安全性**和**多功能性**。

如果你查看之前的应用程序，你可以在 UI 界面中看到，到目前为止，它允许客户端决定要创建的 `Hero` 的 `id`。😱

我们不应该允许这样做，因为他们可能会覆盖我们在数据库中已经分配的 `id`。决定 `id` 的行为应该由**后端**或**数据库**来完成，**而非客户端**。

        // Verify that the configuration was queried for notify buffer size
        verify(mockConfig, atLeastOnce()).getNotifyBufferSize();
    }

    @Test
    @DisplayName("Test multiple instances independence")
    void testMultipleInstancesIndependence() {
        NtTransNotifyChange notify1 = new NtTransNotifyChange(mockConfig, 0x1111, FILE_NOTIFY_CHANGE_FILE_NAME, false);

        long expectedFree = (long) free * sectPerAlloc * bytesPerSect;
        assertEquals(expectedFree, smbInfoAllocation.getFree());
    }

    @Test
    @DisplayName("Test multiple decode calls on same instance")
    void testMultipleDecodeCalls() throws SMBProtocolDecodingException {
        // First decode
        byte[] buffer1 = new byte[22];
        int offset = 0;

        assertEquals(8, tokens.get(2).getStartOffset());
        assertEquals(13, tokens.get(2).getEndOffset());
    }

    @Test
    public void testMultipleAnalyzersIndependence() {
        // Test that multiple analyzer instances work independently
        SuggestAnalyzer analyzer1 = new TestSuggestAnalyzer();
        SuggestAnalyzer analyzer2 = new TestSuggestAnalyzer();

        String text = "test text";

            assertNotNull(response.getDfsResponse());
            assertEquals(0, response.getDfsResponse().getNumReferrals());
        }

        @Test
        @DisplayName("Should handle DFS referral with multiple referrals")
        void testReadDataWireFormatMultipleReferrals() {
            byte[] buffer = createDfsReferralBufferWithMultipleReferrals(3);

 *
 * Note that any other form is unsupported. You may not use asterisks in any position other than
 * the leftmost label.
 *
 * If multiple patterns match a hostname, any match is sufficient. For example, suppose pin A
 * applies to `*.publicobject.com` and pin B applies to `api.publicobject.com`. Handshakes for

	}
	m.handlers.init()
	if ctx == nil {
		ctx = context.Background()
	}

	for _, host := range o.Hosts {
		if host == o.Local {
			if found {
				return nil, fmt.Errorf("grid: local host found multiple times")
			}
			found = true
			// No connection to local.
			continue
		}
		m.targets[host] = newConnection(connectionParams{
			ctx:           ctx,
			id:            m.ID,

/// tip | 提示

用於 HTTPS 的同一個「TLS 終止代理」元件通常也會是「負載平衡器」。

///

而在使用容器時，你用來啓動與管理它們的系統，已內建把「網路通訊」（例如 HTTP 請求）從該「負載平衡器」（也可能是「TLS 終止代理」）傳遞到你的應用容器的工具。

### 一個負載平衡器 - 多個工作容器 { #one-load-balancer-multiple-worker-containers }

使用 Kubernetes 或類似的分散式容器管理系統時，使用其內部網路機制可以讓在主「埠口」上監聽的單一「負載平衡器」，把通訊（請求）傳遞給可能的「多個執行你應用的容器」。

    protected boolean httpOnly = true;

    /**
     * Retrieves the user code for the current request.
     * The user code is used to uniquely identify users across sessions and requests.
     * It checks multiple sources in order: request attribute, request parameter, cookie, user bean, or generates a new one.
     *
     * @return the user code string, or null if no valid session exists
     */
    public String getUserCode() {

        int bytesRead = SessionServicePacket.readn(bais, buffer, 0, 5);

        assertEquals(0, bytesRead);
    }

    @Test
    @DisplayName("readn should handle multiple read calls")
    void testReadnMultipleCalls() throws IOException {
        when(mockInputStream.read(any(byte[].class), anyInt(), anyInt())).thenReturn(2) // First read returns 2 bytes