現在從上一章延伸，補上缺少的部分，完成整個安全流程。

## 取得 `username` 與 `password` { #get-the-username-and-password }

我們要使用 **FastAPI** 提供的安全性工具來取得 `username` 與 `password`。

OAuth2 規範中，當使用「password flow」（我們現在使用的）時，用戶端／使用者必須以表單資料送出 `username` 與 `password` 欄位。

而且規範要求欄位名稱必須就是這兩個，所以像是 `user-name` 或 `email` 都不行。

但別擔心，你在前端要怎麼呈現給最終使用者都可以。

而你的資料庫模型也可以使用任何你想要的欄位名稱。

    }

    // -----------------------------------------------------
    //                                     Parameter Logging
    //                                     -----------------
    // logging filter cannot show the parameters when multi-part so logging here
    protected void showFieldLoggingTitle() {
        if (logger.isDebugEnabled()) {
            logger.debug("[Multipart Request Parameter]");
        }
    }

        };

        SystemHelper systemHelper = new SystemHelper() {
            @Override
            public boolean isChangedClusterState(int status) {
                // Status 0 = GREEN is alive, should not show changed
                return false;
            }

            @Override
            public String getHostname() {
                return "test-hostname";
            }
        };

	SRD	$4, R4, R7              // eb740004000c
	SRD	R1, R4, R7              // eb741000000c
	SRW	$4, R4, R7              // eb74000400de
	SRW	R1, R4, R7              // eb74100000de
	SLW	$4, R3, R6              // eb63000400df
	SLW	R2, R3, R6              // eb63200000df
	SLD	$4, R3, R6              // eb630004000d
	SLD	R2, R3, R6              // eb632000000d
	SRAD	$4, R5, R8              // eb850004000a

          restore-keys: |
            master-${{ runner.os }}-
            master-

      - name: Set up Maven
        shell: bash
        run: mvn --errors --batch-mode --show-version org.apache.maven.plugins:maven-wrapper-plugin:3.3.4:wrapper "-Dmaven=4.0.0-rc-5"

      - name: Prepare Mimir for Maven 4.x
        shell: bash
        run: |
          rm .mvn/extensions.xml

///

/// warning

Have in mind that the `RequestValidationError` contains the information of the file name and line where the validation error happens so that you can show it in your logs with the relevant information if you want to.

        }
    }

    /**
     * Repeatedly match the pattern to the string, calling the closure with the
     * matchers each time there is a match. If there are characters that don't
     * match then blow up. If the closure takes two parameters then the second
     * one is "is this the last match?".
     */
    protected parse(String location, String s, String pattern, Closure c) {
        if (s == null) {

        return streamChatEnhanced(sessionId, userMessage, userId, Collections.emptyMap(), new String[0], callback);
    }

    /**
     * Performs an enhanced streaming chat request with multi-phase RAG flow and search filters.
     * This flow includes: intent detection, keyword search, result evaluation,
     * content retrieval, answer generation, and markdown rendering.
     *
     * @param sessionId the session ID (can be null for new sessions)

labels.virtual_host_value=Virtual Host
labels.append_query_param_enabled=Append Search Parameters
labels.login_required=Login Required
labels.result_collapsed=Collapse Duplicate Results
labels.login_link=Show Login Link
labels.thumbnail=Show Thumbnail
labels.ignore_failure_type=Ignore Failure Types
labels.failure_count_threshold=Failure Count Threshold
labels.popular_word_word_enabled=Popular Word Response
labels.supported_search_web=Web

```console
$ cd docs/en/
```

Then run `mkdocs` in that directory:

```console
$ mkdocs serve --dev-addr 127.0.0.1:8008
```

///

#### Typer CLI (optional)

The instructions here show you how to use the script at `./scripts/docs.py` with the `python` program directly.