by default). An API server fronted by an L7 load balancer that already mitigates these http/2 attacks may choose not to enable the kube-apiserver mitigation to avoid disrupting load balancer → kube-apiserver connections if http/2 requests from multiple clients share the same backend connection. An API server on a private network may choose not to enable the kube-apiserver mitigation to prevent performance regressions for unauthenticated clients. Authenticated requests rely on the fix in golang.org/x/net...

    }

    @Test
    public void testShouldThrowExceptionOnRecursiveScmConnectionReference() throws Exception {
        Scm scm = Scm.newBuilder()
                .connection("${project.scm.connection}/somepath")
                .build();
        Model model = Model.newBuilder().scm(scm).build();

        ModelInterpolator interpolator = createInterpolator();

        System.out.println();
        System.out.println("Parent SCM connection is: " + project0.getScm().getConnection());
        System.out.println("Child SCM connection is: " + project1.getScm().getConnection());
        System.out.println();
        System.out.println(
                "Parent SCM developer connection is: " + project0.getScm().getDeveloperConnection());
        System.out.println(

 */
package okhttp3.internal.connection

import java.io.IOException
import java.util.concurrent.CopyOnWriteArrayList
import java.util.concurrent.LinkedBlockingDeque
import java.util.concurrent.TimeUnit
import okhttp3.internal.concurrent.Task
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.connection.RoutePlanner.ConnectResult
import okhttp3.internal.connection.RoutePlanner.Plan

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.connection

import okhttp3.Route

/**
 * A denylist of failed routes to avoid when creating a new connection to a target address. This is
 * used so that OkHttp can learn from its mistakes: if there was a failure attempting to connect to

- Fixes regression in logging spurious stack traces when proxied connections are closed by the backend ([#82588](https://github.com/kubernetes/kubernetes/pull/82588), [@liggitt](https://github.com/liggitt))

```
ftp> ls runner/chunkdocs/metadata
229 Entering Extended Passive Mode (|||44269|)
150 Opening ASCII mode data connection for file list
-rwxrwxrwx 1 nobody nobody           45 Apr  1 06:13 chunkdocs/metadata
226 Closing data connection, sent 75 bytes
ftp> get
(remote-file) runner/chunkdocs/metadata
(local-file) test
local: test remote: runner/chunkdocs/metadata
229 Entering Extended Passive Mode (|||37785|)

        }
    }

    /* Build a connection. Only one thread will ever call this method at
     * any one time. If this method throws an exception or the connect timeout
     * expires an encapsulating TransportException will be thrown from connect
     * and the transport will be in error.
     */

    protected abstract void doConnect() throws Exception;

    /* Tear down a connection. If the hard parameter is true, the diconnection

            log.trace("Release session " + usage + " " + this);
        }

        if ( usage == 0 ) {
            if ( log.isDebugEnabled() ) {
                log.debug("Usage dropped to zero, release connection " + this.transport);
            }
            synchronized ( this ) {
                if ( this.transportAcquired.compareAndSet(true, false) ) {
                    this.transport.release();
                }

}

/** Returns an immutable copy of this. */
internal fun <T> List<T>.toImmutableList(): List<T> {
  return Collections.unmodifiableList(toMutableList())
}

/** Returns an immutable list containing [elements]. */
@SafeVarargs
internal fun <T> immutableListOf(vararg elements: T): List<T> {
  return Collections.unmodifiableList(listOf(*elements.clone()))
}

/** Closes this, ignoring any checked exceptions. */