final Stack<E> previousElements = new Stack<>();

    /**
     * {@link #nextElements} if {@code next()} was called more recently then {@code previous},
     * {@link #previousElements} if the reverse is true, or -- overriding both of these -- {@code
     * null} if {@code remove()} or {@code add()} has been called more recently than either. We use
     * this to determine which stack to pop from on a call to {@code remove()} (or to pop from and

     * Search logs from these bots will be automatically removed.
     */
    @Size(max = 10000)
    public String purgeByBots;

    /**
     * Email addresses to receive system notifications.
     * Multiple addresses can be specified, separated by commas.
     */
    @Size(max = 1000)
    public String notificationTo;

    /**

To create a middleware you use the decorator `@app.middleware("http")` on top of a function.

The middleware function receives:

* The `request`.
* A function `call_next` that will receive the `request` as a parameter.
    * This function will pass the `request` to the corresponding *path operation*.
    * Then it returns the `response` generated by the corresponding *path operation*.

`get_current_user` will have a dependency with the same `oauth2_scheme` we created before.

The same as we were doing before in the *path operation* directly, our new dependency `get_current_user` will receive a `token` as a `str` from the sub-dependency `oauth2_scheme`:

{* ../../docs_src/security/tutorial002_an_py310.py hl[25] *}

## Get the user { #get-the-user }

import org.apache.maven.artifact.versioning.VersionRange;
import org.apache.maven.project.MavenProject;

/**
 * Wraps an active project instance to be able to receive updates from its artifact without affecting the original
 * attributes of this artifact.
 *
 * TODO I think this exposes a design flaw in that the immutable and mutable parts of an artifact are in one class and

 * error codes, constants and text messages like "The device is not ready"
 * are provided.
 * <p>
 * The jCIFS client maps DOS error codes to NTSTATUS codes. This means that
 * the user may receive a different error from a legacy server than that of
 * a newer variant such as Windows NT and above. If you should encounter
 * such a case, please report it to jcifs at samba dot org and we will
 * change the mapping.
 */

        try {
            while (thread == Thread.currentThread()) {
                in.setLength(RCV_BUF_SIZE);

                socket.setSoTimeout(closeTimeout);
                socket.receive(in);

                if (LogStream.level > 3) {
                    log.println("NetBIOS: new data read from socket");
                }

                nameTrnId = NameServicePacket.readNameTrnId(rcv_buf, 0);

            keyManager.rotateSessionKey(sessionId);
        }

        // Clean up, keeping only 2 versions
        keyManager.cleanupArchivedKeys(2);

        // Verify only recent versions are kept
        assertTrue(keyManager.hasSessionKey(sessionId + ".v4"), "Version 4 should exist");
        assertTrue(keyManager.hasSessionKey(sessionId + ".v3"), "Version 3 should exist");

     <span style="background-color:#007166"><font color="#D3D7CF"> INFO </font></span>  Application startup complete.
```

</div>

O programa de linha de comando chamado `fastapi` é o **FastAPI CLI**.

O FastAPI CLI recebe o caminho para o seu programa Python (por exemplo, `main.py`), detecta automaticamente a instância de `FastAPI` (comumente nomeada `app`), determina a forma correta de importação e então a serve.

 * state indicates that a peer has sent all of its outgoing messages and received all of its
 * incoming messages. But it does not guarantee that the other peer will successfully receive all of
 * its incoming messages.
 */
interface WebSocket {
  /** Returns the original request that initiated this web socket. */
  fun request(): Request

  /**