## O que é "Form Data"

O jeito que os formulários HTML (`<form></form>`) enviam os dados para o servidor normalmente usa uma codificação "especial" para esses dados, a qual é diferente do JSON.

**FastAPI** se certificará de ler esses dados do lugar certo, ao invés de JSON.

/// note | Detalhes Técnicos

You can return *enum members* from your *path operation*, even nested in a JSON body (e.g. a `dict`).

They will be converted to their corresponding values (strings in this case) before returning them to the client:

{* ../../docs_src/path_params/tutorial005.py hl[18,21,23] *}

In your client you will get a JSON response like:

```JSON
{
  "model_name": "alexnet",
  "message": "Deep Learning FTW!"
}
```

Puedes devolver *miembros de enum* desde tu *path operation*, incluso anidados en un cuerpo JSON (por ejemplo, un `dict`).

Serán convertidos a sus valores correspondientes (cadenas en este caso) antes de devolverlos al cliente:

{* ../../docs_src/path_params/tutorial005.py hl[18,21,23] *}

En tu cliente recibirás un response JSON como:

```JSON
{
  "model_name": "alexnet",
  "message": "Deep Learning FTW!"
}
```

		return
	}

	// Rebalance routine is run on the first node of any pool participating in rebalance.
	pools.StartRebalance()

	b, err := json.Marshal(struct {
		ID string `json:"id"`
	}{ID: id})
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	writeSuccessResponseJSON(w, b)

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Wenn Sie dann zu den URLs unter `/openapi.json`, `/docs` oder `/redoc` gehen, erhalten Sie lediglich einen `404 Not Found`-Fehler, wie:

```JSON
{
    "detail": "Not Found"
}

## Daten in etwas JSON-kompatibles konvertieren

Um Daten in etwas JSON-kompatibles zu konvertieren, lesen Sie die Dokumentation unter [Tutorial – JSON-kompatibler Encoder](../tutorial/encoder.md){.internal-link target=_blank}.

## OpenAPI-Metadaten – Dokumentation

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Luego, si vas a las URLs en `/openapi.json`, `/docs`, o `/redoc`, solo obtendrás un error `404 Not Found` como:

```JSON
{
    "detail": "Not Found"
}

```

con un JSON body de:

```JSON
{
    "id": "2expen51ve",
    "customer": "Mr. Richie Rich",
    "total": "9999"
}
```

luego *tu API* procesará la factura, y en algún momento después, enviará un request de callback al `callback_url` (la *API externa*):

```
https://www.external.org/events/invoices/2expen51ve
```

con un JSON body que contiene algo como:

```JSON

package cmd

import (
	"context"
	"errors"
	"strings"
	"time"

	jsoniter "github.com/json-iterator/go"
	"github.com/minio/minio/internal/cachevalue"
)

const (
	dataUsageRoot   = SlashSeparator
	dataUsageBucket = minioMetaBucket + SlashSeparator + bucketMetaPrefix

	dataUsageObjName       = ".usage.json"
	dataUsageObjNamePath   = bucketMetaPrefix + SlashSeparator + dataUsageObjName

				formatMetaV1: formatMetaV1{
					Version: "2",
					Format:  "Erasure",
				},
				Erasure: struct {
					Version          string     `json:"version"`
					This             string     `json:"this"`
					Sets             [][]string `json:"sets"`
					DistributionAlgo string     `json:"distributionAlgo"`
				}{
					Version: "2",
				},
			},
			false,
		},
		// Invalid Erasure format "Unknown".
		{