# Parâmetros de consulta e validações de string { #query-parameters-and-string-validations }

O **FastAPI** permite declarar informações adicionais e validações para os seus parâmetros.

Vamos usar esta aplicação como exemplo:

{* ../../docs_src/query_params_str_validations/tutorial001_py310.py hl[7] *}

 * of which connections to keep open for future use.
 *
 * @constructor Create a new connection pool with tuning parameters appropriate for a single-user
 * application. The tuning parameters in this pool are subject to change in future OkHttp releases.
 * Currently this pool holds up to 5 idle connections which will be evicted after 5 minutes of
 * inactivity.
 */

                os,
                arch,
                testCoverage.testJvmVersion.major.toString(),
                testCoverage.vendor.name.lowercase(),
            )
        val parameters =
            (
                buildToolGradleParameters() +
                    listOf(
                        "-PflakyTests=${FlakyTestStrategy.ONLY}",
                        "-x",

    <option name="METHOD_NAME" value="" />
    <option name="TEST_OBJECT" value="tags" />
    <option name="VM_PARAMETERS" value="-ea -Djunit.jupiter.extensions.autodetection.enabled=true" />
    <option name="PARAMETERS" value="" />
    <option name="TEST_SEARCH_SCOPE">
      <value defaultName="wholeProject" />
    </option>
    <tag value="!Slow &amp; !Slowish &amp; !Remote &amp; !Android" />
    <method v="2">

# Path-параметры { #path-parameters }

Вы можете определить "параметры" или "переменные" пути, используя синтаксис форматированных строк Python:

{* ../../docs_src/path_params/tutorial001_py39.py hl[6:7] *}

Значение параметра пути `item_id` будет передано в функцию в качестве аргумента `item_id`.

In this case, this `__call__` is what **FastAPI** will use to check for additional parameters and sub-dependencies, and this is what will be called to pass a value to the parameter in your *path operation function* later.

## Parameterize the instance { #parameterize-the-instance }

And now, we can use `__init__` to declare the parameters of the instance that we can use to "parameterize" the dependency:

# FastAPI doesn't currently support non-scalar Path parameters...

Essa configuração alteraria o tema de cores de destaque de sintaxe:

<img src="/img/tutorial/extending-openapi/image04.png">

## Alterar parâmetros de UI padrão do Swagger { #change-default-swagger-ui-parameters }

O FastAPI inclui alguns parâmetros de configuração padrão apropriados para a maioria dos casos de uso.

Inclui estas configurações padrão:

{* ../../fastapi/openapi/docs.py ln[9:24] hl[18:24] *}

                listOf("RerunFlakyTest"),
                os,
                arch,
                "%$testJvmVersionParameter%",
                "%$testJvmVendorParameter%",
            )
        val parameters =
            (
                buildToolGradleParameters() +
                    listOf(extraParameters) +
                    functionalTestParameters(os, arch)
            ).joinToString(separator = " ")

          .isEqualTo(Strings.lenientFormat("", Arrays.copyOfRange(params, 2, params.length)));
    }
  }

  /**
   * Returns an array containing parameters for invoking a checkArgument, checkNotNull or checkState
   * method reflectively
   *
   * @param firstParam The first parameter
   * @param sig The method signature
   */
  @GwtIncompatible("ArbitraryInstances")
  @J2ktIncompatible