O `Union` em `Union[str, None]` não é usado pelo FastAPI, mas permitirá que seu editor lhe dê um melhor suporte e detecte erros.

///

## Validação adicional

Nós iremos forçar que mesmo o parâmetro `q` seja opcional, sempre que informado, **seu tamanho não exceda 50 caracteres**.

### Importe `Query`

Para isso, primeiro importe `Query` de `fastapi`:

   *
   * <p>The bulk operations {@code putAll}, {@code equals}, and {@code clear} are not guaranteed to
   * be performed atomically on the returned map. Additionally, {@code size} and {@code
   * containsValue} are implemented as bulk read operations, and thus may fail to observe concurrent
   * writes.
   *
   * @return a serializable concurrent map having the requested features

   * across calls to multiple listeners. Specifically, a given listener will have its callbacks
   * invoked in the same order as the underlying service enters those states. Additionally, at most
   * one of the listener's callbacks will execute at once. However, multiple listeners' callbacks
   * may execute concurrently, and listeners may execute in an order different from the one in which

        assertEquals(2, ruleManager.getGetRuleCallCount());

        ruleManager.getRule(null);
        assertEquals(3, ruleManager.getGetRuleCallCount());
    }

    /**
     * Test concurrent rule additions
     */
    public void test_concurrentAddRule() throws Exception {
        final ThreadSafeRuleManager threadSafeManager = new ThreadSafeRuleManager();
        final int threadCount = 10;

museum.om
net.om
org.om
pro.om

// onion : https://tools.ietf.org/html/rfc7686
onion

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

// pa : http://www.nic.pa/
// Some additional second level "domains" resolve directly as hostnames, such as
// pannet.pa, so we add a rule for "pa".
pa
ac.pa
gob.pa
com.pa
org.pa
sld.pa
edu.pa
net.pa
ing.pa
abo.pa

 * 2^64 + x}). The methods for which signedness is not an issue are in {@link Longs}, as well as
 * signed versions of methods for which signedness is an issue.
 *
 * <p>In addition, this class provides several static methods for converting a {@code long} to a
 * {@code String} and a {@code String} to a {@code long} that treat the {@code long} as an unsigned
 * number.
 *

        if (result > Integer.MAX_VALUE || result < Integer.MIN_VALUE) {
            failedValidations.incrementAndGet();
            integerOverflowsPrevented.incrementAndGet();
            log.warn("Integer overflow in addition: {} + {} = {}", a, b, result);
            throw new SmbException("Integer overflow detected");
        }
        return (int) result;
    }

    /**
     * Safely multiply integers checking for overflow

        return this;
    }

    /**
     * Specifies the prefix.
     * <p>
     * When a prefix is specified, only properties whose names start with the prefix will be included in the copy operation.
     * Additionally, the prefix will be removed from the source property name to form the destination property name.
     * </p>
     *
     * @param prefix
     *            The prefix. Must not be {@literal null} or an empty string.

   * </ul>
   *
   * <p>The overall principle is to continue to treat every checked exception as a checked
   * exception, every unchecked exception as an unchecked exception, and every error as an error. In
   * addition, the cause of any {@code ExecutionException} is wrapped in order to ensure that the
   * new stack trace matches that of the current thread.
   *

/**
 * An unbounded {@linkplain BlockingQueue blocking queue} that uses the same ordering rules as class
 * {@link PriorityQueue} and supplies blocking retrieval operations. While this queue is logically
 * unbounded, attempted additions may fail due to resource exhaustion (causing {@code
 * OutOfMemoryError}). This class does not permit {@code null} elements. A priority queue relying on