contents = f.read()
    print(contents)
```

Por baixo dos panos, o código `open("./somefile.txt")` cria um objeto que é chamado de "Gerenciador de Contexto".

Quando o bloco `with` finaliza, ele se certifica de fechar o arquivo, mesmo que tenha ocorrido alguma exceção.

* AWS: fix volume device assignment race condition ([#31090](https://github.com/kubernetes/kubernetes/pull/31090), [@justinsb](https://github.com/justinsb))
* The certificates API group has been renamed to certificates.k8s.io ([#31887](https://github.com/kubernetes/kubernetes/pull/31887), [@liggitt](https://github.com/liggitt))

- Updated the control plane's trust anchor publisher to create and manage a new ClusterTrustBundle object, associated with the `kubernetes.io/kube-apiserver-serving` X.509 certificate signer. This ClusterTrustBundle contains a PEM bundle in its payload that you can use to verify kube-apiserver serving certificates. ([#127326](https://github.com/kubernetes/kubernetes/pull/127326), [@stlaz](https://github.com/stlaz)) [SIG API Machinery, Apps, Auth, Cluster Lifecycle and Testing]

- Kubernetes 1.24 is built with go1.18, which will no longer validate certificates signed with a SHA-1 hash algorithm by default. See https://golang.org/doc/go1.18#sha1 for more details. If you are using certificates like this in admission or conversion ([#109024](https://github.com/kubernetes/kubernetes/pull/109024), [@stlaz](https://github.com/stlaz))

        }
    }
    
    private boolean isAuthorizedWitnessServer(InetAddress server) {
        // Implementation would check against authorized server list
        // Could use certificates, Kerberos, etc.
        return true;  // Simplified
    }
    
    private boolean isValidNotificationSource(WitnessNotification notification) {
        // Validate notification signature/source

	public final fun check (Ljava/lang/String;[Ljava/security/cert/Certificate;)V
	public fun equals (Ljava/lang/Object;)Z
	public final fun findMatchingPins (Ljava/lang/String;)Ljava/util/List;
	public final fun getPins ()Ljava/util/Set;
	public fun hashCode ()I
	public static final fun pin (Ljava/security/cert/Certificate;)Ljava/lang/String;

pkg crypto/tls, method (*Conn) Write([]uint8) (int, error)
pkg crypto/tls, type Certificate struct
pkg crypto/tls, type Certificate struct, Certificate [][]uint8
pkg crypto/tls, type Certificate struct, Leaf *x509.Certificate
pkg crypto/tls, type Certificate struct, OCSPStaple []uint8
pkg crypto/tls, type Certificate struct, PrivateKey crypto.PrivateKey
pkg crypto/tls, type ClientAuthType int

pkg crypto/tls, type Certificate struct, SignedCertificateTimestamps [][]uint8
pkg crypto/tls, type ConnectionState struct, OCSPResponse []uint8
pkg crypto/tls, type ConnectionState struct, SignedCertificateTimestamps [][]uint8
pkg crypto/x509, method (*CertificateRequest) CheckSignature() error
pkg crypto/x509, type Certificate struct, UnhandledCriticalExtensions []asn1.ObjectIdentifier

It could be another container, for example with <a href="https://traefik.io/" class="external-link" target="_blank">Traefik</a>, handling **HTTPS** and **automatic** acquisition of **certificates**.

/// tip

Traefik has integrations with Docker, Kubernetes, and others, so it's very easy to set up and configure HTTPS for your containers with it.

///

		defer cancel()
		transport, err := s.NewHTTPTransportWithClientCerts(ctx, clientCert, clientKey)
		if err != nil {
			internalLogIf(ctx, fmt.Errorf("Unable to load client key and cert, please check your client certificate configuration: %w", err))
		}
		if transport == nil {
			// Client certs are not readable return default transport.
			return s.NewHTTPTransportWithTimeout(1 * time.Minute)
		}
		return transport
	}