# Request Parameters

Here's the reference information for the request parameters.

These are the special functions that you can put in *path operation function* parameters or dependency functions with `Annotated` to get data from the request.

It includes:

* `Query()`
* `Path()`
* `Body()`
* `Cookie()`
* `Header()`
* `Form()`
* `File()`

You can import them all directly from `fastapi`:

```python

# Request-Parameter

Hier die Referenzinformationen für die Request-Parameter.

Dies sind die Sonderfunktionen, die Sie mittels `Annotated` in *Pfadoperation-Funktion*-Parameter oder Abhängigkeitsfunktionen einfügen können, um Daten aus dem Request abzurufen.

Dies beinhaltet:

* `Query()`
* `Path()`
* `Body()`
* `Cookie()`
* `Header()`
* `Form()`
* `File()`

Sie können diese alle direkt von `fastapi` importieren:

```python

    {!> ../../../docs_src/query_params/tutorial002.py!}
    ```

In this case, the function parameter `q` will be optional, and will be `None` by default.

!!! check
    Also notice that **FastAPI** is smart enough to notice that the path parameter `item_id` is a path parameter and `q` is not, so, it's a query parameter.

## Query parameter type conversion

You can also declare `bool` types, and they will be converted:

      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
        val parameters = sslSocket.sslParameters
        Log.d("CustomSSLSocketFactory", "old applicationProtocols: $parameters.applicationProtocols")
        parameters.applicationProtocols = arrayOf("x-amzn-http-ca")
        sslSocket.sslParameters = parameters
      }

      return sslSocket
    }
  }

  var client = OkHttpClient()

  @Test

    {!> ../../../docs_src/body/tutorial004.py!}
    ```

The function parameters will be recognized as follows:

* If the parameter is also declared in the **path**, it will be used as a path parameter.
* If the parameter is of a **singular type** (like `int`, `float`, `str`, `bool`, etc) it will be interpreted as a **query** parameter.

# Body - Multiple Parameters

Now that we have seen how to use `Path` and `Query`, let's see more advanced uses of request body declarations.

## Mix `Path`, `Query` and body parameters

First, of course, you can mix `Path`, `Query` and request body parameter declarations freely and **FastAPI** will know what to do.

And you can also declare body parameters as optional, by setting the default to `None`:

=== "Python 3.10+"

    }

    private fun writeGenericArguments(
        sw: JvmSignatureWriter,
        arguments: List<TypeProjection>,
        parameters: List<TypeParameterDescriptor>,
        mode: TypeMappingMode
    ) {
        with(KotlinTypeMapper) {
            typeContext.writeGenericArguments(sw, arguments, parameters, mode) { type, sw, mode ->
                mapType(type as KotlinType, mode, sw)
            }

  /** True if the agreed upon extension parameters includes "client_no_context_takeover". */
  @JvmField val clientNoContextTakeover: Boolean = false,
  /** Should be a value in [8..15]. Any value in that range is acceptable by OkHttp. */
  @JvmField val serverMaxWindowBits: Int? = null,
  /** True if the agreed upon extension parameters includes "server_no_context_takeover". */

private
fun JApiMethod.isEnumImplicitMethodValueOf(): Boolean {
    return name == "valueOf" && parameters.size == 1 && parameters.first().type == "java.lang.String"
}


private
fun JApiMethod.isEnumImplicitMethodValues(): Boolean {
    return name == "values" && parameters.size == 0

        apiVersion = KotlinVersion.KOTLIN_1_8
        languageVersion = KotlinVersion.KOTLIN_1_8
        jvmTarget = JvmTarget.JVM_1_8
        freeCompilerArgs.addAll(
            "-Xjsr305=strict",
            "-java-parameters",
            "-Xsam-conversions=class",
        )
    }
}


fun CompilerConfiguration.configureKotlinCompilerForGradleBuild() {

    put(
        CommonConfigurationKeys.LANGUAGE_VERSION_SETTINGS,