This can be quite noticeable when using `docker compose`. See this Docker Compose FAQ section for more technical details: <a href="https://docs.docker.com/compose/faq/#why-do-my-services-take-10-seconds-to-recreate-or-stop" class="external-link" target="_blank">Why do my services take 10 seconds to recreate or stop?</a>.

Crie um token de acesso JWT real e o retorne.

{* ../../docs_src/security/tutorial004_an_py310.py hl[118:133] *}

### Detalhes técnicos sobre o "sujeito" `sub` do JWT { #technical-details-about-the-jwt-subject-sub }

A especificação JWT diz que existe uma chave `sub`, com o sujeito do token.

É opcional usá-la, mas é onde você colocaria a identificação do usuário, então nós estamos usando aqui.

### Step 1: import `FastAPI` { #step-1-import-fastapi }

{* ../../docs_src/first_steps/tutorial001_py39.py hl[1] *}

`FastAPI` is a Python class that provides all the functionality for your API.

/// note | Technical Details

`FastAPI` is a class that inherits directly from `Starlette`.

You can use all the <a href="https://www.starlette.dev/" class="external-link" target="_blank">Starlette</a> functionality with `FastAPI` too.

#### Detalles Técnicos de `lru_cache` { #lru-cache-technical-details }

`@lru_cache` modifica la función que decora para devolver el mismo valor que se devolvió la primera vez, en lugar de calcularlo nuevamente, ejecutando el código de la función cada vez.

We are doing it here to demonstrate how **FastAPI** handles scopes declared at different levels.

///

{* ../../docs_src/security/tutorial005_an_py310.py hl[5,141,172] *}

/// info | Technical Details

`Security` is actually a subclass of `Depends`, and it has just one extra parameter that we'll see later.

That way, you don't have to "install" your local version to be able to test every change.

/// note | Technical Details

This only happens when you install using this included `requirements.txt` instead of running `pip install fastapi` directly.

            // otherwise you end up with a wrong server name for kerberos
            // seems to be correct according to
            // https://lists.samba.org/archive/samba-technical/2009-August/066486.html
            // UniAddress addr = UniAddress.getByName(authDomain, true, tf);
            // SmbTransport trans = tf.getTransportPool().getSmbTransport(tf, addr, 0);

**Technical Details**: If you want to know more of the technical details you can check out the PR description [#4575](https://github.com/tiangolo/fastapi/pull/4575).

### Internal

net.cy
org.cy
press.cy
pro.cy
tm.cy

// cz : https://www.iana.org/domains/root/db/cz.html
cz

// de : https://www.iana.org/domains/root/db/de.html
// Confirmed by registry <******@****.***> (with technical
// reservations) 2008-07-01
de

// dj : https://www.iana.org/domains/root/db/dj.html
dj

// dk : https://www.iana.org/domains/root/db/dk.html
// Confirmed by registry <******@****.***> 2008-06-17

  }

  @CanIgnoreReturnValue
  public MapMaker concurrencyLevel(int concurrencyLevel) {
    checkArgument(
        concurrencyLevel >= 1, "concurrency level (%s) must be at least 1", concurrencyLevel);
    // GWT technically only supports concurrencyLevel == 1, but we silently
    // ignore other positive values.
    return this;
  }

  public <K, V> ConcurrentMap<K, V> makeMap() {
    return new ConcurrentHashMap<K, V>(initialCapacity);