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.

## Use Case

Let's start with an example **use case** and then see how to solve it with this.

 *
 * Typically instances of this class are created, connected and exercised automatically by the HTTP
 * client. Applications may use this class to monitor HTTP connections as members of a
 * [connection pool][ConnectionPool].
 *
 * Do not confuse this class with the misnamed `HttpURLConnection`, which isn't so much a connection
 * as a single request/response exchange.
 *
 * ## Modern TLS
 *

 *  New: `ConnectionPool.setPolicy()` configures a minimum connection pool size for a target
    address. Use this to proactively open HTTP connections.

    Connections opened to fulfill this policy are subject to the connection pool's
    `keepAliveDuration` but do not count against the pool-wide `maxIdleConnections` limit.

```

**FastAPI** erstellt für Sie das Objekt vom Typ `BackgroundTasks` und übergibt es als diesen Parameter.

## Eine Taskfunktion erstellen

Erstellen Sie eine Funktion, die als Hintergrundtask ausgeführt werden soll.

Es handelt sich schlicht um eine Standard-Funktion, die Parameter empfangen kann.

Es kann sich um eine `async def`- oder normale `def`-Funktion handeln. **FastAPI** weiß, wie damit zu verfahren ist.

// If offlineHost is empty, do it for the local disks.
func getOfflineDisks(offlineHost string, endpoints EndpointServerPools) []madmin.Disk {
	var offlineDisks []madmin.Disk
	for _, pool := range endpoints {
		for _, ep := range pool.Endpoints {
			if offlineHost == "" && ep.IsLocal || offlineHost == ep.Host {
				offlineDisks = append(offlineDisks, madmin.Disk{
					Endpoint:  ep.String(),

name: Java CI

on: [push, pull_request, workflow_dispatch]

# clear all permissions for GITHUB_TOKEN
permissions: {}

jobs:
  build:

    # execute on any push, workflow_dispatch  or pull request from forked repo
    if: >
      github.event_name == 'push' ||
      github.event_name == 'workflow_dispatch' ||
      ( github.event_name == 'pull_request' && github.event.pull_request.head.repo.fork )

<div class="termy">

```console
$ pytest

---> 100%
```

</div>

## Details

Der Marker `@pytest.mark.anyio` teilt pytest mit, dass diese Testfunktion asynchron aufgerufen werden soll:

{* ../../docs_src/async_tests/test_main.py hl[7] *}

/// tip | "Tipp"

Beachten Sie, dass die Testfunktion jetzt `async def` ist und nicht nur `def` wie zuvor, wenn Sie den `TestClient` verwenden.

///

import java.io.InputStream;
import java.io.Reader;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.metadata.v4.MetadataStaxReader;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

/**
 * Provide public methods from {@link MetadataStaxReader}
 *
 * @deprecated Maven 3 compatability - please use {@link MetadataStaxReader}
 */
@Deprecated

            .build()
        val response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString())
        if (response.statusCode() > 399) {
            throw RuntimeException("Failed to get pull requests: $uri ${response.statusCode()} ${response.body()}")
        }
        return Gson().fromJson(response.body(), klass)
    }

    private
    fun getUserInfo(login: String): GitHubUser {

    private void generateJavadocs(Project project, ProjectLayout layout, TaskContainer tasks, GradleDocumentationExtension extension) {
        // TODO: Staging directory should be a part of the Javadocs extension
        // TODO: Pull out more of this configuration into the extension if it makes sense
        // TODO: in a typical project, this may need to be the regular javadoc task vs javadocAll

        ObjectFactory objects = project.getObjects();