clientPingInterval: parent.clientPingInterval,
	}
}

// roundtrip performs a roundtrip, returning the first response.
// This cannot be used concurrently.
func (m *muxClient) roundtrip(h HandlerID, req []byte) ([]byte, error) {
	if m.init {
		return nil, errors.New("mux client already used")
	}
	m.init = true
	m.singleResp = true
	msg := message{
		Op:         OpRequest,
		MuxID:      m.MuxID,
		Handler:    h,

Make sure you [Upgrade the FastAPI version](../deployment/versions.md#upgrading-the-fastapi-versions){.internal-link target=_blank} to at least 0.95.1 before using `Annotated`.

///

## Use `Annotated` in the type for the `q` parameter { #use-annotated-in-the-type-for-the-q-parameter }

        raise credentials_exception
    user = get_user(fake_users_db, username=token_data.username)
    if user is None:
        raise credentials_exception
    return user


async def get_current_active_user(
    current_user: Annotated[User, Depends(get_current_user)],
):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user

/// tip

您可以在 `description` 字段中编写 Markdown，它将在输出中呈现。

///

通过这样设置，自动 API 文档看起来会像：

<img src="/img/tutorial/metadata/image01.png">

## 标签元数据

### 创建标签元数据

让我们在带有标签的示例中为 `users` 和 `items` 试一下。

创建标签元数据并把它传递给 `openapi_tags` 参数：

{* ../../docs_src/metadata/tutorial004.py hl[3:16,18] *}

注意你可以在描述内使用 Markdown，例如「login」会显示为粗体（**login**）以及「fancy」会显示为斜体（_fancy_）。

/// tip | 提示

            sb.append(" -DartifactId=");
            sb.append(artifactId);
            sb.append(" -Dversion=");
            sb.append(version);

            // insert classifier only if it was used in the artifact
            if (classifier != null && !classifier.isEmpty()) {
                sb.append(" -Dclassifier=");
                sb.append(classifier);
            }
            sb.append(" -Dpackaging=");

    public boolean isUpdateRequired(RepositoryMetadata metadata, ArtifactRepository repository, File file) {
        // Here, we need to determine which policy to use. Release updateInterval will be used when
        // the metadata refers to a release artifact or meta-version, and snapshot updateInterval will be used when
        // it refers to a snapshot artifact or meta-version.

const crc64NVMEPolynomial = 0xad93d23594c93659

var crc64Table = crc64.MakeTable(bits.Reverse64(crc64NVMEPolynomial))

// Following is ported from C to Go in 2016 by Justin Ruggles, with minimal alteration.
// Used uint for unsigned long. Used uint32 for input arguments in order to match
// the Go hash/crc32 package. zlib CRC32 combine (https://github.com/madler/zlib)
// Modified for hash/crc64 by Klaus Post, 2024.

     * @param request The model building request that holds further settings, must not be {@code null}.
     * @param problems The container used to collect problems that were encountered, must not be {@code null}.
     */
    void expandPluginConfiguration(Model model, ModelBuildingRequest request, ModelProblemCollector problems);

@REM   MAVEN_BATCH_ECHO    (Optional) Set to 'on' to enable the echoing of the batch commands.
@REM   MAVEN_BATCH_PAUSE   (Optional) set to 'on' to wait for a key stroke before ending.
@REM   MAVEN_OPTS          (Optional) Java runtime options used when Maven is executed.
@REM   MAVEN_SKIP_RC       (Optional) Flag to disable loading of mavenrc files.
@REM -----------------------------------------------------------------------------

                404 Not Found errors.
                """
            ),
        ] = None,
        dependency_overrides_provider: Annotated[
            Optional[Any],
            Doc(
                """
                Only used internally by FastAPI to handle dependency overrides.

                You shouldn't need to use it. It normally points to the `FastAPI` app