## OAuth2 { #oauth2 }

OAuth2 is a specification that defines several ways to handle authentication and authorization.

It is quite an extensive specification and covers several complex use cases.

It includes ways to authenticate using a "third party".

That's what all the systems with "login with Facebook, Google, X (Twitter), GitHub" use underneath.

issues/495), and the CRI has been upgraded to v1alpha2, which adds [support for Windows Container Configuration](https://github.com/kubernetes/enhancements/issues/547). Kubernetes v1.10 also ships with the beta release of the [CRI validation test suite](https://github.com/kubernetes/enhancements/issues/292).

The Resource Management Working Group graduated three features to beta in the 1.10 release.  First, [CPU Manager](https://kubernetes.io/docs/tasks/administer-cluster/cpu-management-policies/),...

* ClusterRole aggregation is now GA ([ref](https://github.com/kubernetes/enhancements/issues/502))
* CRI validation test suite is now GA ([ref](https://github.com/kubernetes/enhancements/issues/292))

          </association>
        </field>
        <field>
          <name>site</name>
          <description>Information needed for deploying the web site of the project.</description>
          <version>4.0.0+</version>
          <association>
            <type>Site</type>
          </association>
        </field>
        <field>
          <name>downloadUrl</name>

      HandshakeCertificates certificates = new HandshakeCertificates.Builder()
              .addTrustedCertificate((X509Certificate) isgCertificate)
              // Uncomment to allow connection to any site generally, but will cause
              // noticeable memory pressure in Android apps.
//              .addPlatformTrustedCertificates()
              .build();

 *
 * @author Kevin Bourrillion
 * @author Chris Povirk
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class CollectionToArrayTester<E> extends AbstractCollectionTester<E> {

```

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 [java_sams]: https://kotlinlang.org/docs/reference/java-interop.html#sam-conversions
 [kotlin_sams]: https://youtrack.jetbrains.com/issue/KT-11129
 [mockito]: https://site.mockito.org/
 [proguard_problems]: https://github.com/square/okhttp/issues/5167
 [require_android_5]: https://code.cash.app/okhttp-3-13-requires-android-5

 * directly; please see {@link com.google.common.collect.testing.CollectionTestSuiteBuilder}.
 *
 * @author Chris Povirk
 */
@GwtCompatible
@Ignore("test runners must not instantiate and run this directly, only via suites we build")
// @Ignore affects the Android test runner, which respects JUnit 4 annotations on JUnit 3 tests.
@SuppressWarnings("JUnit4ClassUsedInJUnit3")
public class CollectionRetainAllTester<E> extends AbstractCollectionTester<E> {

import java.util.TreeMap;
import org.jspecify.annotations.Nullable;

/**
 * A wrapper around {@code TreeMap} that aggressively checks to see if keys are mutually comparable.
 * This implementation passes the navigable map test suites.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible
public final class SafeTreeMap<K, V> implements Serializable, NavigableMap<K, V> {
  @SuppressWarnings("unchecked")