ctx := newContext(r, w, "ListObjectsV2")
	api.listObjectsV2Handler(ctx, w, r, false)
}

// listObjectsV2Handler performs listing either with or without extra metadata.
func (api objectAPIHandlers) listObjectsV2Handler(ctx context.Context, w http.ResponseWriter, r *http.Request, metadata bool) {
	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	vars := mux.Vars(r)

<img src="/img/tutorial/header-param-models/image01.png">
</div>

## Prohibir Headers Extra { #forbid-extra-headers }

En algunos casos de uso especiales (probablemente no muy comunes), podrías querer **restringir** los headers que deseas recibir.

Puedes usar la configuración del modelo de Pydantic para `prohibir` cualquier campo `extra`:

{* ../../docs_src/header_param_models/tutorial002_an_py310.py hl[10] *}

		host = ipAddress
	}
	// Strip off IPv6 zone information.
	if i := strings.Index(host, "%"); i > -1 {
		host = host[:i]
	}
	return net.ParseIP(host) != nil
}

// extractHostPort - extracts host/port from many address formats
// such as, ":9000", "localhost:9000", "http://localhost:9000/"
func extractHostPort(hostAddr string) (string, string, error) {
	var addr, scheme string

	if hostAddr == "" {

// that the object was uploaded using SSE-KMS.
func (ssekms) IsEncrypted(metadata map[string]string) bool {
	if _, ok := metadata[MetaSealedKeyKMS]; ok {
		return true
	}
	return false
}

// UnsealObjectKey extracts and decrypts the sealed object key
// from the metadata using KMS and returns the decrypted object
// key.

// must be extracted from the header.
var userMetadataKeyPrefixes = []string{
	"x-amz-meta-",
	"x-minio-meta-",
}

// extractMetadataFromReq extracts metadata from HTTP header and HTTP queryString.
func extractMetadataFromReq(ctx context.Context, r *http.Request) (metadata map[string]string, err error) {

///

## Add extra information { #add-extra-information }

You can declare extra information in `Field`, `Query`, `Body`, etc. And it will be included in the generated JSON Schema.

You will learn more about adding extra information later in the docs, when learning to declare examples.

/// warning

```json
{
    "detail": [
        {
            "type": "extra_forbidden",
            "loc": ["body", "extra"],
            "msg": "Extra inputs are not permitted",
            "input": "Mr. Poopybutthole"
        }
    ]
}
```

## Итоги { #summary }

        "parameters": [
            {
                "required": False,
                "schema": {"title": "Extra Param 1"},
                "name": "extra_param_1",
                "in": "query",
            },
            {
                "required": True,
                "schema": {"title": "Extra Param 2"},
                "name": "extra_param_2",
                "in": "query",
            },
        ]
    },

Stefan Wolf <******@****.***> 1633938695 +0200

        deprecated: Union[deprecated, str, bool, None] = None,
        include_in_schema: bool = True,
        json_schema_extra: Union[dict[str, Any], None] = None,
        **extra: Any,
    ):
        if example is not _Unset:
            warnings.warn(
                "`example` has been deprecated, please use `examples` instead",
                category=FastAPIDeprecationWarning,