![ReDoc](https://fastapi.tiangolo.com/img/index/index-02-redoc-simple.png)

## Example upgrade

Now modify the file `main.py` to receive a body from a `PUT` request.

Declare the body using standard Python types, thanks to Pydantic.

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI
from pydantic import BaseModel

### Use o body do `RequestValidationError`.

O `RequestValidationError` contém o `body` que ele recebeu de dados inválidos.

Você pode utilizá-lo enquanto desenvolve seu app para conectar o *body* e debugá-lo, e assim retorná-lo ao usuário, etc.

Tente enviar um item inválido como este:

```JSON
{

  }

  @Test
  fun get() {
    assumeNotWindows()
    server.enqueue(
      MockResponse.Builder()
        .body("Hello!")
        .setHeader("Content-Type", PLAIN)
        .build(),
    )
    val response = client.newCall(request().build()).execute()
    assertThat(response.body).isNotNull()
    response.body.bytes()
    logRecorder
      .assertLogMatch(Regex("""callStart: Request\{method=GET, url=$url\}"""))

## Beispiel Aktualisierung

Ändern Sie jetzt die Datei `main.py`, um den <abbr title="Body – Körper, Inhalt: Der eigentliche Inhalt einer Nachricht, nicht die Metadaten">Body</abbr> einer `PUT`-Anfrage zu empfangen.

Deklarieren Sie den Body mithilfe von Standard-Python-Typen, dank Pydantic.

```Python hl_lines="4  9-12  25-27"
from typing import Union

from fastapi import FastAPI

	fileSize, err := strconv.Atoi(fileSizeStr)
	if err != nil {
		s.writeErrorResponse(w, err)
		return
	}

	done, body := keepHTTPReqResponseAlive(w, r)
	done(s.getStorage().CreateFile(r.Context(), origvolume, volume, filePath, int64(fileSize), body))
}

// DeleteVersionHandler delete updated metadata.

    val header: String? = recordedRequest.getHeader("")
    var chunkSizes: List<Int> = recordedRequest.chunkSizes
    var bodySize: Long = recordedRequest.bodySize
    var body: Buffer = recordedRequest.body
    var utf8Body: String = recordedRequest.body.readUtf8()
    var sequenceNumber: Int = recordedRequest.sequenceNumber
    var tlsVersion: TlsVersion? = recordedRequest.tlsVersion

// it is used to ignore custom encoding charset in S3 XML body.
func nopCharsetConverter(label string, input io.Reader) (io.Reader, error) {
	return input, nil
}

// xmlDecoder provide decoded value in xml.
func xmlDecoder(body io.Reader, v interface{}, size int64) error {
	var lbody io.Reader
	if size > 0 {
		lbody = io.LimitReader(body, size)
	} else {
		lbody = body
	}
	d := xml.NewDecoder(lbody)

		// More than maxConfigSize bytes were available
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrAdminConfigTooLarge), r.URL)
		return
	}

	// Ensure body content type is opaque to ensure that request body has not
	// been interpreted as form data.
	contentType := r.Header.Get("Content-Type")
	if contentType != "application/octet-stream" {

      url = "https://cash.app/".toHttpUrl(),
    )
    ```

 *  New: `Response.body` is now non-null. This was generally the case in OkHttp 4.x, but the Kotlin
    type declaration was nullable to support rare cases like the body on `Response.cacheResponse`,
    `Response.networkResponse`, and `Response.priorResponse`. In such cases the body is now
    non-null, but attempts to read its content will fail.

    ```kotlin
    val response: Response = call.execute()
    val multipartReader = MultipartReader(response.body!!)

    multipartReader.use {
      while (true) {
        val part = multipartReader.nextPart() ?: break
        process(part.headers, part.body)
      }
    }
    ```

 *  New: `MediaType.parameter()` gets a parameter like `boundary` from a media type like