# Segurança - Primeiros Passos

Vamos imaginar que você tem a sua API **backend** em algum domínio.

E você tem um **frontend** em outro domínio ou em um path diferente no mesmo domínio (ou em uma aplicação mobile).

E você quer uma maneira de o frontend autenticar o backend, usando um **username** e **senha**.

Nós podemos usar o **OAuth2** junto com o **FastAPI**.

// BackendType - represents different backend types.
type BackendType int

// Enum for different backend types.
const (
	Unknown = BackendType(madmin.Unknown)
	// Filesystem backend.
	BackendFS = BackendType(madmin.FS)
	// Multi disk BackendErasure (single, distributed) backend.
	BackendErasure = BackendType(madmin.Erasure)
	// Add your own backend.
)

    if (isLoom()) {
      val backend = TaskRunner.RealBackend(loomThreadFactory())
      val taskRunner = TaskRunner(backend)

      OkHttpClient.Builder()
        .connectionPool(
          buildConnectionPool(
            connectionListener = connectionListener,
            taskRunner = taskRunner,
          ),
        )
        .dispatcher(Dispatcher(backend.executor))
        .taskRunnerInternal(taskRunner)

{
    "backend.maxHeapSizeMb": 2602,

    // https://youtrack.jetbrains.com/issue/FL-22276
    // Fleet cannot handle nested maven projects until FL-22276
    "ignored.project.globs": [
        "**/pom.xml"
    ]

resultsCache:
  enabled: false
chunksCache:
  enabled: false
singleBinary:
  replicas: 1
deploymentMode: SingleBinary
gateway:
  enabled: false
read:
  replicas: 0
write:
  replicas: 0
backend:

                                maxRequestsPerConnection:
                                  description: Maximum number of requests per connection
                                    to a backend.
                                  format: int32
                                  type: integer
                                maxRetries:
                                  description: Maximum number of retries that can

			return opts, InvalidVersionID{
				Bucket:    bucket,
				Object:    object,
				VersionID: vid,
			}
		}
	}

	// default case of passing encryption headers to backend
	opts, err = getDefaultOpts(r.Header, false, nil)
	if err != nil {
		return opts, err
	}
	opts.PartNumber = partNumber
	opts.VersionID = vid

# Sicherheit – Erste Schritte

Stellen wir uns vor, dass Sie Ihre **Backend**-API auf einer Domain haben.

Und Sie haben ein **Frontend** auf einer anderen Domain oder in einem anderen Pfad derselben Domain (oder in einer mobilen Anwendung).

Und Sie möchten eine Möglichkeit haben, dass sich das Frontend mithilfe eines **Benutzernamens** und eines **Passworts** beim Backend authentisieren kann.

Wir können **OAuth2** verwenden, um das mit **FastAPI** zu erstellen.

		t.Fatal(err)
	}

	if _, _, err = formatErasureMigrate(rootPath); err == nil {
		t.Fatal("Expected to fail with unexpected backend format")
	}

	m = &formatErasureV1{}
	m.Format = formatBackendErasure
	m.Version = formatMetaVersionV1
	m.Erasure.Version = "30"
	m.Erasure.Disk = mustGetUUID()

![Erasure](https://github.com/minio/minio/blob/master/docs/screenshots/erasure-code.jpg?raw=true)