```

////

Se um cliente tentar enviar alguns **cabeçalhos extra**, eles irão receber uma resposta de **erro**.

Por exemplo, se o cliente tentar enviar um cabeçalho `tool` com o valor `plumbus`, ele irá receber uma resposta de **erro** informando que o parâmetro do cabeçalho `tool` não é permitido:

```json
{
    "detail": [
        {
            "type": "extra_forbidden",

	NSScanner(ctx context.Context, cache dataUsageCache, updates chan<- dataUsageEntry, scanMode madmin.HealScanMode, shouldSleep func() bool) (dataUsageCache, error)

	// Volume operations.
	MakeVol(ctx context.Context, volume string) (err error)
	MakeVolBulk(ctx context.Context, volumes ...string) (err error)
	ListVols(ctx context.Context) (vols []VolInfo, err error)

func (p *Parser) positiveAtoi(str string) int64 {
	value, err := strconv.ParseInt(str, 0, 64)
	if err != nil {
		p.errorf("%s", err)
	}
	if value < 0 {
		p.errorf("%s overflows int64", str)
	}
	return value
}

func (p *Parser) atoi(str string) uint64 {
	value, err := strconv.ParseUint(str, 0, 64)
	if err != nil {
		p.errorf("%s", err)
	}
	return value
}

	authTypeStreamingUnsignedTrailer
)

// Get request authentication type.
func getRequestAuthType(r *http.Request) (at authType) {
	if r.URL != nil {
		var err error
		r.Form, err = url.ParseQuery(r.URL.RawQuery)
		if err != nil {
			authNLogIf(r.Context(), err)
			return authTypeUnknown
		}
	}
	if isRequestSignatureV2(r) {
		return authTypeSignedV2
	} else if isRequestPresignedSignatureV2(r) {

type ErrUnknownRegion struct {
	Region string
}

func (err ErrUnknownRegion) Error() string {
	return fmt.Sprintf("unknown region '%v'", err.Region)
}

// ErrARNNotFound - ARN not found error.
type ErrARNNotFound struct {
	ARN ARN
}

func (err ErrARNNotFound) Error() string {
	return fmt.Sprintf("ARN '%v' not found", err.ARN)
}

// ErrInvalidARN - invalid ARN error.
type ErrInvalidARN struct {

}

// LookupConfig - lookup config and override with valid environment settings if any.
func LookupConfig(kvs config.KVS) (cfg Config, err error) {
	cfg = Config{
		MaxTimeout: 30 * time.Second,
	}
	if err = config.CheckValidKeys(config.DriveSubSys, kvs, DefaultKVS); err != nil {
		return cfg, err
	}

	// if not set. Get default value from environment

		MaxNoncurrentVersions   int            `xml:"MaxNoncurrentVersions,omitempty"`
	}

	var val noncurrentExpiration
	err := d.DecodeElement(&val, &startElement)
	if err != nil {
		return err
	}
	if val.MaxNoncurrentVersions > 0 {
		val.NewerNoncurrentVersions = val.MaxNoncurrentVersions
	}
	*n = NoncurrentVersionExpiration{
		XMLName:                 val.XMLName,

// ParseConfig - parses data in given reader to VersioningConfiguration.
func ParseConfig(reader io.Reader) (*Versioning, error) {
	var v Versioning
	if err := xml.NewDecoder(reader).Decode(&v); err != nil {
		return nil, err
	}
	if err := v.Validate(); err != nil {
		return nil, err
	}
	return &v, nil

func Check(t *testing.T) {
	checkFiles, err := filepath.Glob(filepath.Join(testenv.GOROOT(t), "api/go1*.txt"))
	if err != nil {
		t.Fatal(err)
	}

	var nextFiles []string
	if v := runtime.Version(); strings.Contains(v, "devel") || strings.Contains(v, "beta") {
		next, err := filepath.Glob(filepath.Join(testenv.GOROOT(t), "api/next/*.txt"))
		if err != nil {
			t.Fatal(err)
		}
		nextFiles = next
	}

	var zeroKey [32]byte
	for i, test := range ssecParseTests {
		key, err := SSEC.ParseHTTP(test.Header)
		if err != test.ExpectedErr {
			t.Errorf("Test %d: want error '%v' but got '%v'", i, test.ExpectedErr, err)
		}

		if err != nil && key != zeroKey {
			t.Errorf("Test %d: parsing failed and client key is not zero key", i)
		}
		if err == nil && key == zeroKey {
			t.Errorf("Test %d: parsed client key is zero key", i)