params[i] = ArbitraryInstances.get(sig.get(i));
        }
      }
    }
    return params;
  }

  private static final ImmutableList<Class<?>> POSSIBLE_PARAM_TYPES =
      ImmutableList.of(char.class, int.class, long.class, Object.class);

  /**
   * Returns a list of parameters for invoking an overload of checkState, checkArgument or
   * checkNotNull
   *

   *         .collect(
   *             flatteningToImmutableListMultimap(
   *                  str -> str.charAt(0),
   *                  str -> str.substring(1).chars().mapToObj(c -> (char) c));
   *
   * // is equivalent to
   *
   * static final ImmutableListMultimap<Character, Character> FIRST_LETTER_MULTIMAP =
   *     ImmutableListMultimap.<Character, Character>builder()

		p.expectOperandEnd()
		return
	}

	// Constant.
	haveConstant := false
	switch tok.ScanToken {
	case scanner.Int, scanner.Float, scanner.String, scanner.Char, '+', '-', '~':
		haveConstant = true
	case '(':
		// Could be parenthesized expression or (R). Must be something, though.
		tok := p.next()
		if tok.ScanToken == scanner.EOF {

     */

    public String getPath() {
        return url.toString();
    }

    String getUncPath0() {
        if (unc == null) {
            final char[] in = url.getPath().toCharArray();
            final char[] out = new char[in.length];
            final int length = in.length;
            int i, o, state;
            final int s;

            /* The canonicalization routine
             */

    // A more organic OOM from a toString implementation
    Object object =
        new Object() {
          @Override
          public String toString() {
            return new String(new char[50_000]);
          }
        };
    List<Object> list = Collections.singletonList(object);
    for (int i = 0; i < 10; i++) {
      Object[] array = new Object[500];
      Arrays.fill(array, list);

Abra seu navegador em [http://127.0.0.1:8000/items/5?q=somequery](http://127.0.0.1:8000/items/5?q=somequery).

Você verá a resposta JSON como:

```JSON
{"item_id": 5, "q": "somequery"}
```

Você acabou de criar uma API que:

* Recebe requisições HTTP nos _paths_ `/` e `/items/{item_id}`.
* Ambos _paths_ fazem operações `GET` (também conhecido como _métodos_ HTTP).

Mas ele ainda faz parte da mesma aplicação/web API **FastAPI** (faz parte do mesmo "pacote Python").

Você pode criar as *operações de rota* para esse módulo usando o `APIRouter`.

### Importe `APIRouter` { #import-apirouter }

Você o importa e cria uma "instância" da mesma maneira que faria com a classe `FastAPI`:

    if (part.length() < 1 || part.length() > MAX_DOMAIN_PART_LENGTH) {
      return false;
    }

    /*
     * GWT claims to support java.lang.Character's char-classification methods, but it actually only
     * works for ASCII. So for now, assume any non-ASCII characters are valid. The only place this
     * seems to be documented is here:

    assertEquals(Boolean.FALSE, ArbitraryInstances.get(boolean.class));
    assertEquals(Boolean.FALSE, ArbitraryInstances.get(Boolean.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(char.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(Character.class));
    assertEquals(Byte.valueOf((byte) 0), ArbitraryInstances.get(byte.class));

   *         .collect(
   *             flatteningToImmutableListMultimap(
   *                  str -> str.charAt(0),
   *                  str -> str.substring(1).chars().mapToObj(c -> (char) c));
   *
   * // is equivalent to
   *
   * static final ImmutableListMultimap<Character, Character> FIRST_LETTER_MULTIMAP =
   *     ImmutableListMultimap.<Character, Character>builder()