But still, it is very powerful, and allows you to declare arbitrarily deeply nested dependency "graphs" (trees).

/// tip

All this might not seem as useful with these simple examples.

But you will see how useful it is in the chapters about **security**.

And you will also see the amounts of code it will save you.

# Security Tools

When you need to declare dependencies with OAuth2 scopes you use `Security()`.

But you still need to define what is the dependable, the callable that you pass as a parameter to `Depends()` or `Security()`.

There are multiple tools that you can use to create those dependables, and they get integrated into OpenAPI so they are shown in the automatic docs UI, they can be used by automatically generated clients and SDKs, etc.

// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"context"
	"encoding/base64"
	"errors"
	"fmt"
	"io"

 * and their completion status.
 */
public class RdmaWorkRequest {

    /**
     * Type of RDMA work request
     */
    public enum RequestType {
        /** Send operation */
        SEND,
        /** Receive operation */
        RECEIVE,
        /** RDMA read operation */
        READ,
        /** RDMA write operation */
        WRITE
    }

    private final long requestId;

Nevertheless, you still enforce those scopes, or any other security/authorization requirement, however you need, in your code.

In many cases, OAuth2 with scopes can be an overkill.

But if you know you need it, or you are curious, keep reading.

///

## OAuth2 scopes and OpenAPI { #oauth2-scopes-and-openapi }

Continue reading. 👇🤓

///

## Why Virtual Environments { #why-virtual-environments }

To work with FastAPI you need to install <a href="https://www.python.org/" class="external-link" target="_blank">Python</a>.

After that, you would need to **install** FastAPI and any other **packages** you want to use.

     */
    private static <K, V> Entry<K, V> @Nullable [] lastEntryForEachKey(
        Entry<K, V>[] entries, int size) {
      Set<K> seen = new HashSet<>();
      BitSet dups = new BitSet(); // slots that are overridden by a later duplicate key
      for (int i = size - 1; i >= 0; i--) {
        if (!seen.add(entries[i].getKey())) {
          dups.set(i);
        }
      }
      if (dups.isEmpty()) {
        return null;

     * @throws IOException if an I/O error occurs
     */
    protected abstract Long peekKey() throws IOException;

    /**
     * Send a request over the transport
     *
     * @param request the request to send
     * @throws IOException if an I/O error occurs
     */
    protected abstract void doSend(Request request) throws IOException;

    /**

        discloser.setPlainText("Test Content");

        // Should call both sendToSlack and sendToGoogleChat
        try {
            notificationHelper.send(null, discloser);
        } catch (Exception e) {
            fail("send() should not throw an exception: " + e.getMessage());
        }
    }

    public void test_toSlackMessage_withOnlySubject() {

  -e "MINIO_ROOT_PASSWORD=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY" \
  quay.io/minio/minio server /data --console-address ":9001"
```

To create a MinIO container with persistent storage, you need to map local persistent directories from the host OS to virtual config. To do this, run the below commands

### GNU/Linux and macOS

```sh
mkdir -p ~/minio/data

docker run \
  -p 9000:9000 \
  -p 9001:9001 \