And also after the `response` is generated, before returning it.

For example, you could add a custom header `X-Process-Time` containing the time in seconds that it took to process the request and generate a response:

```Python hl_lines="10  12-13"
{!../../docs_src/middleware/tutorial001.py!}
```

/// tip

    - 🔍 [Pydantic](https://docs.pydantic.dev) FastAPI的依赖项之一，用于数据验证和配置管理。
    - 💾 [PostgreSQL](https://www.postgresql.org) 作为SQL数据库。
- 🚀 [React](https://react.dev) 用于前端。
    - 💃 使用了TypeScript、hooks、[Vite](https://vitejs.dev)和其他一些现代化的前端技术栈。
    - 🎨 [Chakra UI](https://chakra-ui.com) 用于前端组件。
    - 🤖 一个自动化生成的前端客户端。
    - 🧪 [Playwright](https://playwright.dev)用于端到端测试。
    - 🦇 支持暗黑主题（Dark mode）。

  // Returns a map from variable names to their data types.  Slices of a
  // partitioned tensor are combined into a single entry.
  const TensorSliceReader::VarToDataTypeMap& GetVariableToDataTypeMap() const;

  // Attempts to look up the tensor named "name" and stores the found result in
  // "out_tensor".
  void GetTensor(const string& name,
                 std::unique_ptr<tensorflow::Tensor>* out_tensor,
                 TF_Status* out_status) const;

    return {"fresh_value": fresh_value}
```

////

## Recap

Apart from all the fancy words used here, the **Dependency Injection** system is quite simple.

Just functions that look the same as the *path operation functions*.

But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

```

It will be clearly marked as deprecated in the interactive docs:

<img src="/img/tutorial/path-operation-configuration/image04.png">

Check how deprecated and non-deprecated *path operations* look like:

<img src="/img/tutorial/path-operation-configuration/image05.png">

## Recap

            p += read;
        }
        if ( expectEof ) {
            assertEquals("Expecting EOF", -1, is.read(buffer, 0, 1));
        }
        log.debug("Read " + length + " took " + ( System.currentTimeMillis() - start ));
    }


    /**
     * @param bufSize
     * @param length
     * @param os
     * @throws IOException
     */

    val domainLabelsUtf8Bytes = Array(domainLabels.size) { i -> domainLabels[i].toByteArray() }

    // Start by looking for exact matches. We start at the leftmost label. For example, foo.bar.com
    // will look like: [foo, bar, com], [bar, com], [com]. The longest matching rule wins.
    var exactMatch: String? = null
    for (i in domainLabelsUtf8Bytes.indices) {

                                        <la:link href="/admin/dict"
                                                 styleClass="btn btn-default btn-xs">
                                            <em class="fa fa-book">
                                            <la:message key="labels.dict_list_link"/>
                                        </la:link>
                                        <la:link href="../list/0/?dictId=${f:u(dictId)}"

                                        <la:link href="/admin/dict"
                                                 styleClass="btn btn-default btn-xs">
                                            <em class="fa fa-book">
                                            <la:message key="labels.dict_list_link"/>
                                        </la:link>
                                        <la:link href="../list/0/?dictId=${f:u(dictId)}"

 * JavaScript parser `urltestparser.js` with which this class attempts to be compatible.
 *
 * Each line of the `urltestdata.txt` file specifies a test. Lines look like this:
 *
 * ```
 * http://example\t.\norg http://example.org/foo/bar s:http h:example.org p:/
 * ```
 */
class WebPlatformUrlTestData {
  var input: String? = null
  var base: String? = null