This can be very useful for setting up **resources** that you need to use for the whole app, and that are **shared** among requests, and/or that you need to **clean up** afterwards. For example, a database connection pool, or loading a shared machine learning model.

所有的这些都是可复用的工具和组件，可以轻松与你的系统，数据仓库，关系型以及 NoSQL 数据库等等集成。

### 依赖注入 { #dependency-injection }

FastAPI 有一个使用非常简单，但是非常强大的<dfn title='也称为 "components"、"resources"、"services"、"providers"'><strong>依赖注入</strong></dfn>系统。

* 甚至依赖也可以有依赖，创建一个层级或者**“图”依赖**。
* 所有**自动化处理**都由框架完成。
* 所有的依赖关系都可以从请求中获取数据，并且**增加了路径操作**约束和自动文档生成。
* 即使是在依赖项中定义的路径操作参数也会**自动验证**。
* 支持复杂的用户身份认证系统，**数据库连接**等等。
* **不依赖**数据库，前端等。但是和它们集成很简单。

        if (bytes.length != 16) {
            throw new IllegalArgumentException("GUID must be 16 bytes");
        }
        ByteBuffer bb = ByteBuffer.wrap(bytes);
        long mostSig = bb.getLong();
        long leastSig = bb.getLong();
        this.guid = new UUID(mostSig, leastSig);
    }
    
    public byte[] toBytes() {
        ByteBuffer bb = ByteBuffer.allocate(16);
        bb.putLong(guid.getMostSignificantBits());

 * can be changed (See <a href="../../../resolver.html">Setting Name
 * Resolution Properties</a>). The servername and path components are
 * not case sensitive but the domain, username, and password components
 * are. It is also likely that properties must be specified for jcifs
 * to function (See <a href="../../overview-summary.html#scp">Setting
 * JCIFS Properties</a>). Here are some examples of SMB URLs with brief

        // Verify
        assertNull(result);
    }

    @Test
    public void test_getResponse_withUnsetType() {
        // Execute - requesting type without setting response
        ActionResponse result = authenticator.getResponse(SsoResponseType.METADATA);

        // Verify
        assertNull(result);
    }

    // Test logout method
    @Test

* Kubelet will no longer set hairpin mode on every interface on the machine when an error occurs in setting up hairpin for a specific interface. ([#36990](https://github.com/kubernetes/kubernetes/pull/36990), [@bboreham](https://github.com/bboreham))

            // Expected for some implementations
        }
    }

    @Test
    public void test_process_withStatusCodeSetting() throws IOException, ServletException {
        // Test setting different status codes
        StatusCodeWebApiManager manager = new StatusCodeWebApiManager(404);

        TestHttpServletRequest request = new TestHttpServletRequest();

     */
    public void setFilterConfig(final FilterConfig f) {
        try {
            init(f);
        } catch (final Exception e) {
            logger.error("Error setting filter config", e);
        }
    }

    /**
     * Gets the filter configuration.
     * @return the filter configuration or null
     */
    public FilterConfig getFilterConfig() {

            ntlmServlet.service(request, response);

            // When NtlmSsp.authenticate returns null, the service method returns early
            // without setting session attributes
            verify(session, never()).setAttribute(anyString(), any());
        }
    }

    /**
     * Test the service method with a valid Basic Authorization header.

        final String ls = System.lineSeparator();
        Properties properties = getBuildProperties();
        StringBuilder version = new StringBuilder(256);
        version.append(MessageUtils.builder().strong(createMavenVersionString(properties)))
                .append(ls);
        version.append(reduce(properties.getProperty("distributionShortName") + " home: "