Si abres en tu navegador una URL como:

```
http://127.0.0.1:8000/items/foo-item
```

...sin agregar el parámetro requerido `needy`, verás un error como:

```JSON
{
  "detail": [
    {
      "type": "missing",
      "loc": [
        "query",
        "needy"
      ],
      "msg": "Field required",
      "input": null
    }
  ]
}
```

Sie können den `jsonable_encoder` verwenden, um die empfangenen Daten in etwas zu konvertieren, das als JSON gespeichert werden kann (z. B. in einer NoSQL-Datenbank). Zum Beispiel, um ein `datetime` in einen `str` zu konvertieren.

{* ../../docs_src/body_updates/tutorial001_py310.py hl[28:33] *}

Si vous ouvrez une URL comme :

```
http://127.0.0.1:8000/items/foo-item
```

...sans ajouter le paramètre requis `needy`, vous aurez une erreur :

```JSON
{
    "detail": [
        {
            "loc": [
                "query",
                "needy"
            ],
            "msg": "field required",
            "type": "value_error.missing"

		Name:  "quiet",
		Usage: "disable startup and info messages",
	},
	cli.BoolFlag{
		Name:  "anonymous",
		Usage: "hide sensitive information from logging",
	},
	cli.BoolFlag{
		Name:  "json",
		Usage: "output logs in JSON format",
	},
	// Deprecated flag, so its hidden now, existing deployments will keep working.
	cli.BoolFlag{
		Name:   "compat",

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package store

import (
	"bytes"
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"sort"
	"sync"
	"time"

	"github.com/google/uuid"
	jsoniter "github.com/json-iterator/go"
	"github.com/klauspost/compress/s2"
	"github.com/valyala/bytebufferpool"
)

const (
	defaultLimit = 100000 // Default store limit.

// https://docs.aws.amazon.com/AmazonS3/latest/dev/replication-add-config.html
type Config struct {
	XMLName xml.Name `xml:"ReplicationConfiguration" json:"-"`
	Rules   []Rule   `xml:"Rule" json:"Rules"`
	// RoleArn is being reused for MinIO replication ARN
	RoleArn string `xml:"Role" json:"Role"`
}

// Maximum 2MiB size per replication config.
const maxReplicationConfigSize = 2 << 20

minio
!*/
site/
**/*.test
**/*.sublime-workspace
/.idea/
/Minio.iml
**/access.log
vendor/
.DS_Store
*.syso
coverage.txt
.vscode/
*.tar.bz2
parts/
prime/
stage/
.sia_temp/
config.json
node_modules/
mc.*
s3-check-md5*
xl-meta*
healing-*
inspect*.zip
200M*
hash-set
minio.RELEASE*
mc
nancy
inspects/*
.bin/
*.gz
docs/debugging/s3-verify/s3-verify

```txt
Hello, World from Flask!
```

Und wenn Sie auf <a href="http://localhost:8000/v2" class="external-link" target="_blank">http://localhost:8000/v2</a> gehen, sehen Sie die Response von FastAPI:

```JSON
{
    "message": "Hello World"
}

func (err *s3Error) Error() string {
	return err.message
}

func errJSONParsingError(err error) *s3Error {
	return &s3Error{
		code:       "JSONParsingError",
		message:    fmt.Sprintf("Encountered an error parsing the JSON file: %v. Check the file and try again.", err),
		statusCode: 400,
		cause:      err,
	}

/// tip

Keep in mind that if you return a response directly instead of using the `Response` parameter, FastAPI will return it directly.

So, you will have to make sure your data is of the correct type. E.g. it is compatible with JSON, if you are returning a `JSONResponse`.

And also that you are not sending any data that should have been filtered by a `response_model`.

///

### More info { #more-info }

/// note | Technical Details