Tout ceci est donc ce qui donne sa force à **FastAPI** (à travers Starlette) et lui permet d'avoir des performances aussi impressionnantes.

## Détails très techniques

!!! warning "Attention !"
    Vous pouvez probablement ignorer cela.

    Ce sont des détails très poussés sur comment **FastAPI** fonctionne en arrière-plan.

    plan1.tcpConnectDelayNanos = 10.ms // Connect at time = 260 ms.
    plan1.tlsConnectDelayNanos = 10.ms // Connect at time = 270 ms.
    plan1.tlsConnectThrowable = IOException("boom!")

    val plan2 = plan1.createConnectTlsNextPlan()
    plan2.tcpConnectDelayNanos = 270.ms // Connect at time = 540 ms.

    val plan3 = plan0.createRetry()
    plan3.tcpConnectDelayNanos = 10.ms // Connect at time = 530 ms.

import okio.BufferedSource
import okio.buffer
import okio.sink
import okio.source

/**
 * A single attempt to connect to a remote server, including these steps:
 *
 *  * [TCP handshake][connectSocket]
 *  * Optional [CONNECT tunnels][connectTunnel]. When using an HTTP proxy to reach an HTTPS server
 *    we must send a `CONNECT` request, and handle authorization challenges from the proxy.
 *  * Optional [TLS handshake][connectTls].
 *

    val connect = planConnect()

    // Now that we have a set of IP addresses, make another attempt at getting a connection from
    // the pool. We have a better chance of matching thanks to connection coalescing.
    val pooled2 = planReusePooledConnection(connect, connect.routes)
    if (pooled2 != null) return pooled2

    return connect
  }

  /**

)

// LookupUserDN searches for the full DN and groups of a given short/login
// username.
func (l *Config) LookupUserDN(username string) (string, []string, error) {
	conn, err := l.LDAP.Connect()
	if err != nil {
		return "", nil, err
	}
	defer conn.Close()

	// Bind to the lookup user account
	if err = l.LDAP.LookupBind(conn); err != nil {
		return "", nil, err
	}

	// Lookup user DN

                      "cluster": "outbound|9080||productpage.default.svc.cluster.local",
                      "timeout": "0s",
                      "retry_policy": {
                        "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
                        "num_retries": 2,
                        "retry_host_predicate": [
                          {

Seulement le minimum nécessaire pour les utiliser avec **FastAPI** sera couvert... ce qui est en réalité très peu.

**FastAPI** est totalement basé sur ces annotations de type, qui lui donnent de nombreux avantages.

Mais même si vous n'utilisez pas ou n'utiliserez jamais **FastAPI**, vous pourriez bénéficier d'apprendre quelques choses sur ces dernières.

!!! note

                    Hexdump.hexdump( log, sbuf, 4, n );
                }
            }
        }
    }
    public void connect() throws SmbException {
        try {
            super.connect( RESPONSE_TIMEOUT );
        } catch( TransportException te ) {
            throw new SmbException( "Failed to connect: " + address, te );
        }
    }
    protected void doConnect() throws IOException {
        /*

        super(connection.getURL());
        this.connection = connection;
        requestProperties = new HashMap();
    }

    public void connect() throws IOException {
        if (connected) return;
        connection.connect();
        connected = true;
    }

    private void handshake() throws IOException {
        if (handshakeComplete) return;
        doHandshake();

        }

    }


    /*
     * 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;


    /*